P.S. What is the difference betwen SA-75 and SA-75M (exept the "dog house")?


Please check the The Family Tree and timeline of the “75” System development part of the manual.

There were 4 versions of the Dvina system.
1, SA-75 Dvina “five van” (SA-2A) with V-750 1D (Guideline mod.0) and 750V 11D (Guideline mod.1)
2, SA-75M Dvina “three van” (SA-2B) with V-750V 11D (Guideline mod.1)
3, SA-75MK Dvina “three van” (SA-2B) with V-750VK 11DK (Guideline mod.1)
4, SA-75M/MK Dvina “doghouse” (SA-2F) with V-750VM/VMK 11DM/DMK (Guideline mod.1)