FA: 77mm Mamiya Lenscap Marked "m 645, RB"

Here's another item that came in a box of miscelaneous stuff I got in
a trade.  It's a Mamiya lenscap marked on the inside "M645" and "RB"
and "77Ø"  The last means it will fit a lens which accepts 77mm
filters.  It's in very good condition. 

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=330015753722