Artist signatures continue to show collector premiums, and it all depends on who signed the card. Here's a look at 3 recent signed vs unsigned auction sales: PSA 10 10 Hitoshi Ariga Japanese Pokemon Booster Pack Variety Bundle 12 Packs PackSpotTCG Pokemon 25th Anniversary Japanese Card Price Guide One Year Later Price Check! Japan2UK The UK's Largest & No.1 Japanese TCG & Collectables Store! Pokemon Japanese TCG High Class Pack Shiny Treasure ex SV4A Booster Box (JP) Japanese Pokmon TCG: White Flare & Black Bolt Holo Horse Games LLC