1. The 1930 type was built on the White Russian train General Drozdowski. It was designed and built on this platform due to lack of materials and funding. It was fitted with a 107mm 1910/30 repaired from the civil war. During this time Military Warehouse Workshop №60 (военсклада №60 or Voensklada №60) drew up a new design to improve upon this model.
2. The VS-60 had a simple 20mm steel cylindrical turret. 6 double hatches went around its circumference to easily remove equipment from the turret and for better ventilation. A ball mounted maxim was also installed in the turret. Production began in 1931 at Voensklada №60 and then ended in 1932. I believe 15 were produced, one of them later becoming part of Panzerzug 28.
full-size: https://farm1.staticflickr.com/637/2098 ... 22a8_o.png
3. VS-60 with a new 20-hedron (sided) turret entered pre-production in 1932. Interior lighting and central heating were new to this version. 2 examples were made before testing began on January 28th 1933 and concluded on March 5th 1933. A long list of recommendations was made to improve it, one being an anti-aircraft MG in the rear. Most recommendations however had not been met in the redesign and this upset officials greatly. Nonetheless, serial production started at Красный Профинтерн (Red Profintern?). 8 were completed in 1933 with another 2 in 1934. One is in German use in this ebay photo.
4. The PT-33 was also produced starting in 1933 but with a newer turret. Originally documented as the PT-33 it was later document as the PT-35 (starting in 1935). 12 of this type were made at Voensklada №60, plus two converted VS-60 models. The PT-33 and PT-35 are essentially the same.
full-size: https://farm6.staticflickr.com/5779/209 ... ed46_o.png
5. The PT-36 was meant to incorporate the earlier recommendations, including an AA MG. It was planned to use a newly produced 107mm M60 gun instead of the 1910./30. One example was built for testing, and this later became the PT-38 with a 122mm gun.
full-size: https://c2.staticflickr.com/6/5638/2170 ... cdac_o.png
