This card has the letter “D” written in faint marker pen on the back as displayed in the photo. I believe it can be removed however I wouldn’t want to risk further damage to the card by doing it myself.

The Machamp card from the Base Set Shadowless collection is a highly sought-after Holo Rare in the Pokémon TCG. This exclusive card features the artwork by illustrator Ken Sugimori, with a HP of 100 and being a 1st Edition. As part of the Deck Exclusives set, this English-language Pokémon card is a valuable addition for collectors and players alike.