Most any blacksmith can fix a Cloth shutter on a M or CanonP metal one. The Cosinas are more difficult and noisy. My M42 SLR is a Cosina and is well reliable but noisy for people shooting their rangefinders are quieter but still more noisy than a M2 or CanonP.
Originally Posted by momus
A beaten up M makes good jewelry...
A Cosina SLR says COSINA on name plate terrible for street cred. You get sympathy.
An M is more expensive than a P or R probably best to get a LTM R if you go Cosina unless you buy new.