{ "url": "https://www.moonstonehq.com/articles/mewtwo-and-mew-gx-sm191-value", "slug": "mewtwo-and-mew-gx-sm191-value", "title": "Mewtwo & Mew GX SM191 Value: 638 PSA 10 Sales", "summary": "The promo asks $387.37 and its PSA 10 sells for $2,125.00 on 638 verified sales, the 49th deepest sold tape of the 5,879 cards in our graded cohort.", "section": "Card study", "published": "2026-09-23", "readMinutes": 9, "publisher": "moonstone", "findings": [ { "value": "$2,125.00", "measures": "PSA 10 sold median, 638 verified sales", "basis": "September 23 2026, against a $387.37 raw ask" }, { "value": "19,995", "measures": "PSA submissions on an unshared registry line", "basis": "9,935 of them tens, read September 23 2026" }, { "value": "5.49x", "measures": "PSA 10 premium, 25th percentile of 5,879", "basis": "the cohort median is 12.35x" } ], "tables": [ { "title": "Mewtwo & Mew GX SM191 graded ladder, all rows read September 23 2026", "columns": [ "Grade", "Sold median", "Verified sales", "Multiple of the raw ask" ], "rows": [ { "Grade": "PSA 10", "Sold median": "$2,125.00", "Verified sales": "638", "Multiple of the raw ask": "5.49x" }, { "Grade": "BGS 9.5", "Sold median": "$1,453.34", "Verified sales": "9", "Multiple of the raw ask": "3.75x" }, { "Grade": "CGC 10", "Sold median": "$1,095.00", "Verified sales": "37", "Multiple of the raw ask": "2.83x" }, { "Grade": "CGC 9.5", "Sold median": "$755.00", "Verified sales": "8", "Multiple of the raw ask": "1.95x" }, { "Grade": "BGS 9", "Sold median": "$579.50", "Verified sales": "8", "Multiple of the raw ask": "1.50x" }, { "Grade": "PSA 9", "Sold median": "$517.50", "Verified sales": "315", "Multiple of the raw ask": "1.34x" }, { "Grade": "CGC 9", "Sold median": "$463.75", "Verified sales": "25", "Multiple of the raw ask": "1.20x" }, { "Grade": "Raw (ask, not a sale)", "Sold median": "$387.37", "Verified sales": "n/a", "Multiple of the raw ask": "1.00x" } ] }, { "title": "Mewtwo & Mew GX SM191 against the 5,879-product graded-ladder cohort", "columns": [ "Measure", "This card", "Cohort median", "Percentile", "Rank" ], "rows": [ { "Measure": "Verified PSA 10 sales", "This card": "638", "Cohort median": "14", "Percentile": "99.1", "Rank": "49 of 5,879" }, { "Measure": "Raw ask", "This card": "$387.37", "Cohort median": "$18.93", "Percentile": "97.4", "Rank": "151 of 5,879" }, { "Measure": "PSA registry line", "This card": "19,995", "Cohort median": "822", "Percentile": "96.7", "Rank": "194 of 5,879" }, { "Measure": "Gem rate", "This card": "49.7%", "Cohort median": "44.4%", "Percentile": "58.4", "Rank": "2,448 of 5,879" }, { "Measure": "PSA 10 premium", "This card": "5.49x", "Cohort median": "12.35x", "Percentile": "25.1", "Rank": "4,406 of 5,879" } ] }, { "title": "The five deepest sold tapes among 106 English tag-team cards, September 23 2026", "columns": [ "Card", "Set", "Raw ask", "PSA 10 sold", "Verified sales", "Premium", "Registry" ], "rows": [ { "Card": "[Moltres & Zapdos & Articuno GX](/card/smp-SM210)", "Set": "SM Black Star Promos", "Raw ask": "$153.72", "PSA 10 sold": "$435.00", "Verified sales": "917", "Premium": "2.83x", "Registry": "77,360" }, { "Card": "[Moltres & Zapdos & Articuno GX](/card/sm115-44)", "Set": "Hidden Fates", "Raw ask": "$49.33", "PSA 10 sold": "$155.21", "Verified sales": "647", "Premium": "3.15x", "Registry": "21,050" }, { "Card": "[Mewtwo & Mew GX](/card/smp-SM191)", "Set": "SM Black Star Promos", "Raw ask": "$387.37", "PSA 10 sold": "$2,125.00", "Verified sales": "638", "Premium": "5.49x", "Registry": "19,995" }, { "Card": "[Moltres & Zapdos & Articuno GX](/card/sm115-69)", "Set": "Hidden Fates", "Raw ask": "$47.02", "PSA 10 sold": "$134.70", "Verified sales": "446", "Premium": "2.86x", "Registry": "27,007" }, { "Card": "[Pikachu & Zekrom GX](/card/smp-SM168)", "Set": "SM Black Star Promos", "Raw ask": "$216.07", "PSA 10 sold": "$1,965.00", "Verified sales": "438", "Premium": "9.09x", "Registry": "14,595" } ] }, { "title": "Every product named Mewtwo & Mew GX, by raw ask, September 23 2026, rows sum to 10", "columns": [ "Card", "Set", "Number", "Raw ask", "PSA 10 sold", "Sales", "Registry" ], "rows": [ { "Card": "[Mewtwo & Mew GX](/card/jat-574601)", "Set": "SM11: Miracle Twin (Japanese)", "Number": "098/094", "Raw ask": "$450.00", "PSA 10 sold": "$3,200.00", "Sales": "26", "Registry": "5,994" }, { "Card": "[Mewtwo & Mew GX](/card/sm11-242)", "Set": "[Unified Minds](/set/unified%20minds)", "Number": "242/236", "Raw ask": "$420.76", "PSA 10 sold": "$2,070.00", "Sales": "43", "Registry": "2,910" }, { "Card": "[Mewtwo & Mew GX](/card/smp-SM191)", "Set": "SM Black Star Promos", "Number": "SM191/248", "Raw ask": "$387.37", "PSA 10 sold": "$2,125.00", "Sales": "638", "Registry": "19,995" }, { "Card": "[Mewtwo & Mew GX](/card/sm11-222)", "Set": "[Unified Minds](/set/unified%20minds)", "Number": "222/236", "Raw ask": "$189.39", "PSA 10 sold": "$689.99", "Sales": "12", "Registry": "2,157" }, { "Card": "[Mewtwo & Mew GX](/card/jat-574611)", "Set": "SM11: Miracle Twin (Japanese)", "Number": "108/094", "Raw ask": "$169.99", "PSA 10 sold": "$700.00", "Sales": "14", "Registry": "1,211" }, { "Card": "[Mewtwo & Mew GX](/card/sm11-71)", "Set": "[Unified Minds](/set/unified%20minds)", "Number": "71/236", "Raw ask": "$142.98", "PSA 10 sold": "$893.19", "Sales": "133", "Registry": "6,872" }, { "Card": "[Mewtwo & Mew GX](/card/jat-572875)", "Set": "SM12a: Tag All Stars (Japanese)", "Number": "222/173", "Raw ask": "$109.99", "PSA 10 sold": "$1,075.00", "Sales": "14", "Registry": "2,575" }, { "Card": "[Mewtwo & Mew GX](/card/jat-574600)", "Set": "SM11: Miracle Twin (Japanese)", "Number": "097/094", "Raw ask": "$76.75", "PSA 10 sold": "$537.50", "Sales": "24", "Registry": "1,922" }, { "Card": "[Mewtwo & Mew GX](/card/jat-572706)", "Set": "SM12a: Tag All Stars (Japanese)", "Number": "052/173", "Raw ask": "$39.21", "PSA 10 sold": "$132.25", "Sales": "46", "Registry": "11,514" }, { "Card": "[Mewtwo & Mew GX](/card/jat-574532)", "Set": "SM11: Miracle Twin (Japanese)", "Number": "029/094", "Raw ask": "$35.28", "PSA 10 sold": "$150.75", "Sales": "136", "Registry": "5,565" } ] } ], "charts": [], "sections": [ "The full ladder", "Where it sits in the catalog", "A tag team with a promo's supply", "The cards people buy by mistake", "What the registry did, and what the tape did", "Proving the registry line belongs to this card", "What this study cannot show", "What would overturn this" ], "method": [ "Sources: the `cards` catalog, `price_history`, `graded_snapshots` and `population_snapshots` in production, read on day 20719, September 23 2026. The card is resolved by NAME AND NUMBER against the catalog: Mewtwo & Mew GX, number SM191, set SM Black Star Promos, catalog id smp-SM191, TCGplayer product id 197856. A folded same-name sweep returns ten products: three other English rows (Unified Minds 71, 222 and 242) and six Japanese rows, all ten priced on the day and all ten printed above. The sweep folds EVERY catalog row claiming each product id, not the row that survives deduplication: both Tag All Stars printings are claimed by a jat- row carrying the romanised name and a ja- row carrying the Japanese-script name, the script row wins the dedupe, and a sweep over surviving names alone returns eight. RAW is an ASK, the day-20719 `price_history` reading. GRADED figures are SOLD medians over verified completed sales with the sale count beside them, taken from the latest `graded_snapshots` row per grade across BOTH keyspaces, catalog id and product id, with the fresher row winning; for this card the product-id keyspace is fresher at every grade. REGISTRY is `population_snapshots`, latest reading per key, September 23 2026 for this card; the latest day differs per card across this series and is stated individually. Gem rates pass `gemRateIsTrustworthy()`, which rejects the rows written before 2026-09-09 that recorded an absent PSA 10 breakdown as zero: the September 14 reading on this card is one of those and is excluded, so the growth window runs September 7 to September 23 on readings that both carry a gem count. Registry lines are tested for sharing by `sharedRegistryKeys()` over all 24,385 population keys (883 flagged, 788 products affected, this card not among them) and by the grade-by-grade pooling ratio described below. Two assertions run over the graded rows this series prints, and they do not cover the same rows. STALENESS: on every product this module prints a graded figure for, and after the fresher-keyspace rule, any median dated before day 20695, the first day of the current daily tape, is dropped, because the never-refreshed catalog-id keyspace holds rows old enough to invert against their own neighbouring grade. That assertion runs on all 258 graded rows the 66 products this module links carry, at every grade and every grader, and removes exactly one, a CGC 10 dated day 20694 on a card whose graded figures are not printed here, leaving 257. The cohort below is built WITHOUT that gate: applied across the whole catalog it drops nine PSA 10 medians, leaving 8,684 products with a PSA 10 median on two or more sales and a cohort of 5,871, 4,183 English and 1,688 Japanese, and no rank printed in this series moves by more than seven places. POOLING RATIO: recorded sales at a grade divided by the registry count at that grade. This is NOT an impossibility test, and calling it one would be wrong: `graded_snapshots` counts SALES and one slab can sell more than once, so a ratio above 1 is evidence that a graded key is pooling another product, not a physical contradiction. The declared bar is 1.0. `population_snapshots` records a per-grade count at PSA 10 and PSA 9 only, so the ratio is computable on 114 of those 257 rows and on no BGS or CGC row at all; the highest of the 114 is 0.94, 29 PSA 10 sales against the 31 tens on the Wizards-era Eevee's line, and only three exceed 0.5. THE COHORT: 63,600 catalog rows deduplicate to 62,388 products on the TCGplayer product id, 1,212 rows collapsing; 44,400 carry a day-20719 ask; 20,805 carry an unshared registry reading; 18,239 of those support a trustworthy gem rate; 8,693 carry a PSA 10 sold median on two or more verified sales; 5,879 carry all four and are the cohort, 4,191 English and 1,688 Japanese. Percentile is the share of the cohort strictly below this card's value; rank counts from the top with ties counted; medians are upper-middle on even samples. The tag-team population is the 106 cohort members whose English name contains an ampersand and ends GX, ex or EX. The volatility figures use every adjacent-day pair in the PSA 10 graded tape (67,275 pairs on 9,048 keys) and every adjacent-day pair in `price_history` days 20714 to 20719 (261,184 pairs on 52,474 products), the later window chosen because days 20704 to 20713 are partial. The weekly per-card series is `ppthist:197856`, whose first reading is January 27 2025 and last September 22 2026; series that lost their 2025 start to a refresh bug are excluded from any 2025 claim and this one did not. Not financial advice." ], "terms": "Figures are moonstone's own recorded measurements, dated as published. Quote them with the population stated beside them. The article at `url` is the human form of this file." }