This is a super ugly Magikarp, but a piece of history!
We didn't really get 1st edition up here in Canada, but we did see the Shadowless print. Here is a Magikarp! PSA10.
There are only 235 PSA 10 Shadowless Magikarps! That is pretty darn low pop!
https://www.psacard.com/cert/54989084/psa