So, whats the MOST RARE or MOST ORIGINAL item in your Neo Geo Collection?

Metal Slug 1 AES

 

Probably nothing too rare, as I only have MVS stuff. Here's what I've got:

 

this is easy because there are only 3 games left in my AES collection.I think,MS 3 is the rarest of them.

Metal Slug X
Metal Slug 3
Garou MotW

but my rarest neogeo "item" is probably the MS 3 promo flyer(s).