Catalog entry revision

1st version

Type 1a. Frame counter, 6 screws on the side-plate, film window is left-sided. Leningrad markings. 1st type of shutter design.
Examples known: #472169 (sovietcams), #476444 (Fedka, film window is centered).

Type 1b. Identical to type 1a, but with 2nd type of shutter design.
Examples known: #479208 (Enn), #4713334 (Fedka).

2nd version

No frame counter anymore, 6 screws on the side-plate, film window is centered already. Leningrad markings. 2nd type of shutter design.
Examples known: #4724641 (sovietcams), #4744666 (Enn), #4747241 (Enn).

3rd version

Type 3a. 6 screws on the side-plate, Leningrad markings, 3rd type of shutter design. Has markings “Model A” on the top plate.
Examples known: 4845952 (Enn).

Type 3b. Identical to type 3a, but without "Model A" markings on the top plate.
Examples known: #4828613 (eBay 2008), #4876455 (Fedka), #48126660 (sovietcams), #48128228 (Fedka).

Type 3c. Identical to type 3b, but without 6 screws on the side-plate anymore.
Examples known: #48112211 (Enn), #4911579 (Fedka), #4954231 (Fedka).

4th version

3rd type of shutter design, but comes with new T-22 6.3/75 lens.
Examples known: #4958015 (sovietcams), #499994 (Alex-Store 2008).

5th version

Type 5a. 4th type of shutter design, T-22 6.3/75 lens, New shutter sequence added: B, 1/10s, 1/25s, 1/50s, 1/100s and 1/200s. Still Leningrad markings on the frontplate.
Examples known: #5008095 (Enn).

Type 5b. Camera identical to type 5a, but no more Leningrad markings on the fronplate.
Examples known: #5023658 (Fedka).