Historical timeline.
1. TOZ-A (internal hammers) was a first Tula shotgun made in 1902-1940 (other sources state 1908-1912, 1922-1940). Gauges: 12, 16, 20, 24. Haven't observed them in North America.
Picture of TOZ-A (from public sources)

2. TOZ-B (external hammers) (1902-1917, 1928-1941, 1945-1957). 16ga, 20ga, custom order 24ga. Haven't seen them in North America.
Picture of TOZ-B from public sources.

3. TOZ-25 (internal hammers). Very short production time range (1963-1966). Mod 1 12ga (700mm and 720mm barrels) fewer made, Mod 2 16ga (700mm and 730mm barrels) is more common. Stock has unique two parts design which is somehow an integral part of the action, but haven't disassembled mine yet to confirm it. These are quite unicorns, I have seen only two in the wild, as I understand they were never imported by businesses, but some of them sneaked out with recent Balkan shotguns import to Canada.
Pictures of TOZ-25 from author's collection.

Note TOZ-25 markings


4. TOZ-BM (1957-1969) - 16ga, 20ga, 700mm to 720mm. Based on Model B, it has visually different lock of forend. Model B has one if front, and BM is on the bottom of the forend. Over the course pf productions there were some visually noticeable changes including in the shape of the hammers. In general barrels were not chrome-lines, however see TOZ-63 description for exceptions.
Pictures of TOZ-BM from author's collection.

Note "BM-16" markings.


5. TsKIB (ЦКИБ) was a workshop specializing in high grade finish of TOZ-B and TOZ-BM. They were sourcing these models at different stages of manufacturing and finishing them into custom grade shotguns under their own brand.
1. TOZ-A (internal hammers) was a first Tula shotgun made in 1902-1940 (other sources state 1908-1912, 1922-1940). Gauges: 12, 16, 20, 24. Haven't observed them in North America.
Picture of TOZ-A (from public sources)

2. TOZ-B (external hammers) (1902-1917, 1928-1941, 1945-1957). 16ga, 20ga, custom order 24ga. Haven't seen them in North America.
Picture of TOZ-B from public sources.

3. TOZ-25 (internal hammers). Very short production time range (1963-1966). Mod 1 12ga (700mm and 720mm barrels) fewer made, Mod 2 16ga (700mm and 730mm barrels) is more common. Stock has unique two parts design which is somehow an integral part of the action, but haven't disassembled mine yet to confirm it. These are quite unicorns, I have seen only two in the wild, as I understand they were never imported by businesses, but some of them sneaked out with recent Balkan shotguns import to Canada.
Pictures of TOZ-25 from author's collection.

Note TOZ-25 markings


4. TOZ-BM (1957-1969) - 16ga, 20ga, 700mm to 720mm. Based on Model B, it has visually different lock of forend. Model B has one if front, and BM is on the bottom of the forend. Over the course pf productions there were some visually noticeable changes including in the shape of the hammers. In general barrels were not chrome-lines, however see TOZ-63 description for exceptions.
Pictures of TOZ-BM from author's collection.

Note "BM-16" markings.


5. TsKIB (ЦКИБ) was a workshop specializing in high grade finish of TOZ-B and TOZ-BM. They were sourcing these models at different stages of manufacturing and finishing them into custom grade shotguns under their own brand.
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