The Ungraded Mew ex #347 from Shiny Treasure ex (Japanese) has a median market value of $382, based on 254 recent graded sales. See the full price history and live chart on the Mew ex #347 card page.
The Ungraded Mew ex #347 from Shiny Treasure ex (Japanese) has a median market value of $382, with recent sales ranging $125 to $1,026 — based on 254 recent graded sales.
Where do PokéTT's Ungraded prices come from?
PokéTT tracks real graded sales across eBay, Yahoo Auctions and Mercari, then shows the median within the Ungraded grade — not a single outlier sale — so the mark reflects the true market.