MEW 1st EDITION how much it worth

I have learned today thanks to my friend that I have gotten a hold of a 1st edition Mew card (from a older siblings friend who bought Pokemon cards back then) I had no idea it was 1st edition till today and I want to know how much it is worth.

While I'd love to help, there's a lot of different Mew cards. You'll have to be more specific.