Fed evolved the Fed 3 by adding a selenium lightmeter. It gave the Fed 4, type "a" based on the mechanics of the Fed 3a, type "b" based on the mechanics of 3b. This one is type b.
Fed 4, Industar 61L
Fed 4, Industar 61L, with brown leather case, bought by Christophe in a second-hand fair on may 1st, 2012 for 12€
Revue 4, offered by Mickaël as a thanking for the repair of his Fed 5. Received November 21, 2012
This Revue 4 is a Fed renamed for the German distributor Foto-Quelle. It is a newer model, with some mechanical differences. I changed the shutter curtains.