As I understand it's in the picture scale display switching speed by "V"
x1, x2 multiplier is switching speeds as I understand it.
x1 to 1000 m/sec!
x2 up to 2000 m/sec!
S-200 maximum target speed of 1200 m/sec!

Correct.
You can destroy targets with flight speed of maximum 1200m/s (Mach4), but you can track targets with a maximum speed of 2000m/s (over Mach6).

Hpasp
Free SAM Simulator, "Realistic to the Switch"
(U-2 over Sverdlovsk, B-52's over Hanoi, F-4 Phantoms over the Sinai, F-16's and the F-117A Stealth bomber over the Balkans.)
http://sites.google.com/site/samsimulator1972/home

Book from the author - Soviet Nuclear Weapons in Hungary 1961-1991
https://sites.google.com/view/nuclear-weapons-in-hungary/
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