<p>From your picture the screen + metal frame on a C33 looks identical to the screen + frame on my C330, but I may be wrong. If I were you, I'd get in touch with Rick Oleson, who makes screens for various TLRs. He'd be able to tell you for sure. His e-mail address is on this page:<br>
http://rick_oleson.tripod.com/index-175.html<br>
I see he makes screens for the earlier C models like the C33. I've dealt with Rick -- he's a nice guy, very helpful.</p>