Base Set Meowth, Error?,,

[Xtreme888max]

This card has a green spot in the corner of the card. It is about a half a centimeter in diameter. There is also a black thing that looks like a weird seed of some sort. Or a rowboat thats sinking. Hard to tell. So Iwas wondering if this was a factory error and if it was to increase its value or something? If it does how mch is it worth now? Sorry.I don't have a scanner to show the card

Also. how much is a black-star promo card like marill worth?

[BJJ763]

Meowth was in Base? If you have a Meowth without a set symbol. It's a fake.

If you have a Jungle Meowth, that's more of a printing error. Really not considered a rarity. You might find someone willing to pay $1 for it.