Not sure if this is known, but scraping signatures to make them look engraved also works on glocks that don't have a black handle and finished slide : r/GlobalOffensive
The most valuable or expensive PGL Stockholm Major player autograph stickers - Dot Esports
Steam Community :: Guide :: Sticker Scraping - Make cheap skins look very great!
Volkrays Creative Car Sticker Fast & Furious Paul Walker Signature Words Accessories Sunscreen Vinyl Decal Black/Silver,8cm*11cm|Car Stickers| - AliExpress