X-men (1992) was made by Konami.
X-Men - Children of the Atom (1994) and X-Men vs. Street Fighter (1996) were made by Capcom.
According to this page and this page, a Data East board marked "DE-0343-4" (upper left in your pic) is Tumble Pop.
Scott,
Right about X-men, that is why I was confused. I know they were all Kanomi/Capcom.
Thanks for the fast reply and for the helpful information. I was not clear on what number was the identifyer - you cleared that up. Really appreciate it.
Looks like I was probably scammed a little over a decade ago
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