Lens mount question

[renem24]

Can somebody tell me what kind of mount is this?

http://www.pbase.com/renem24/inbox

I want to buy an adaptor for an EOS body but I have no ideea from which camera is.
Thank you in advance for your answer

[etrose]

Could be an Exakta mount.

[samjudkins]

It might also be a 42mm screw mount.

[lawrencetob]

An Exakta Lens to Canon EOS Camera Adapter on eBay.
http://cgi.ebay.com.cn/ws/eBayISAPI.dll ... AME%3ALNLK