The only difference this camera appears to have from the Sokol-1 is the addition of a hot shoe and deletion of flash receptacles. This camera was manufactured from 1977. The case for this camera is made of black or brown leather with a plastic lens cover that has LOMO in raised letters. There is a rare version with the "Mark of best quality" on a little plate inset into the top next to the cable release. (source: http://www.commiecameras.com/sov/electroniccameras/index.htm)
Produced: 1977-1986
Name: „Сокол-2“
Producer: LOMO.
Frame size: 24x36 cm.
Lens: Industar-70 2.8/50.
Shutter: 1/30s, 1/60s, 1/125s, 1/250s, 1/500s + B.
Quantity: unknown. (sovietcams.com)