This is a rare Yunost Prototype
No information available about Mayak, but about Yunost:
Produced: 1957-1961
Name: „Юность“
Producer: GOMZ
Frame size: 24x36 mm.
Lens: Triplet -32 3.5/45.
Shutter: 1/8s, 1/15s, 1/30s, 1/60s, 1/125s, 1/250s + B.
Quantity: 51.026 units.