The FED-4 was produced in two versions.
This first version FED-4a with wind knob and lower viewfinder
was modified from FED-3a to accept a light meter.
The light meter control knob is where the rewind knob was
so the rewind knob now sticks out of the side.
Name: „ФЭД FED 4“
Frame size: 24x36
Lens: Industar-61 panda
Shutter: 1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500 and B
Quantity: 633.096 units (all types 4a and 4b according to sovietcams.com)
Photos 5, 6: FED 4a #4012977 and I-61 #081136 (Panda)