51 Bowman FB?

Sorry i don't know how to link. I was looking at this card, but am a little concerned by the description. Why would they use a different id unless they have something to hide. Any thoughts?
Again, sorry for not having a link.
http://cgi.ebay.com/1951-Bowman-Football-Card-4-Norman-Van-Brocklin-EX_W0QQitemZ120157916307QQihZ002QQcategoryZ215QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Again, sorry for not having a link.
http://cgi.ebay.com/1951-Bowman-Football-Card-4-Norman-Van-Brocklin-EX_W0QQitemZ120157916307QQihZ002QQcategoryZ215QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
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Vintage Football Card Gallery
Seller says that a scan of the back is available on request, ask them about their other ID
(I am kind of curious because Carlisle PA is 20 minutes from me and I would have to think that a 5000+ feedback user has to be in something other than vintage football cards or I would have heard of them)