[1952Sniper]

Just a guess -- But with the red operating knob it was likely a 1911 or variation. Perhaps even an 89 though the magazine appears too small -
Might even be a golden state conversion to 30/30 --
In any event it only has value as a shooter --

My money is on it being a sporterized 1911 model.

There are some good comparison photos of the different models here:

http://www.swissrifles.com/sr/detail/