Well I would never trade a complete Metal Slug 3 cart for a bare Metal Slug 1 cart, authentic or not. For approximately the same amount of money as a MS3 home cart, you can have a complete converted MS1 homebrew cart made, complete with insert, cart sticker, and manual. The converted cart will of course play the same and be worth more, since it is at least complete, albeit not an authentic original cart. A bare MS1 cart to me isn't worth more than the minimum cost of converting an MVS MS1 cart . . . which would be in the area of 200 or so, give or take . . . Just my opinion.