Strange 12C with clear back case on eBay

Unique 12C for sales on eBay with clear back case:
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 0338364434
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 0338364434
All about the HP-41C caclulators
http://forum.hp41.org/