I'd be really interested in more pictures. I'm not convinced that it's a model 36. It looks more like a 38 M&P (pre-model 10.) I think the model 36 or Chiefs Special always had a coiled main spring. The one in your picture has a strain screw in the grip, indicating a flat main spring.
If my suspicion is correct, I'd put it between $500 and $650 in that condition.
For reference (and because I can't help myself.) This is a round butt 38 M&P:
This is a 1955 Chiefs Special (pre-model 36):
If my suspicion is correct, I'd put it between $500 and $650 in that condition.
For reference (and because I can't help myself.) This is a round butt 38 M&P:
This is a 1955 Chiefs Special (pre-model 36):
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