There are 4 auctions, all for the same weird size: 10" diameter and around 4" or 5" deep. Seller says only one side has a bearing edge. (Or in the case of these drums: a barely edge) Made for a travel kit maybe?

Anyway these are, as they say, "a piece of drum history". Or a piece of something. ;)

http://cgi.ebay.com/SLINGERLAND-10-DRUM-SHELL-W-LUGS-GREAT-FOR-PROJECT_W0QQitemZ280479180157

http://cgi.ebay.com/SLINGERLAND-10-DRUM-SHELL-W-LUGS-GREAT-FOR-PROJECT_W0QQitemZ280479180590

http://cgi.ebay.com/SLINGERLAND-10-DRUM-SHELL-GREAT-FOR-PROJECT_W0QQitemZ280479182698

http://cgi.ebay.com/SLINGERLAND-10-DRUM-SHELL-GREAT-FOR-PROJECT_W0QQitemZ280479182905