Thanks for the link. I will see what I can dig up there!
Actually, searching for just the right keywords on google I was able to find this answer...
The thread is locked and answered by an actual Capcom rep, so that seems pretty cool!
While interesting, I don't really think the Capcom rep is correct about that being "extra rare". Indeed, there is only one of each number created in theory but hundreds of the un-numbered version which makes it less special IMHO.