An honorable mention is the Zorki 2. Not so many of these were made, but I have been able to find a cheap, working camera from time to time. The Zorki 2 has a much-improved shutter mechanism, and still retains the apearance and pocketability of the original Barnack Leica. Other good features are strap lugs and a self timer. The last one I bought even had a flash synch.