Welcome to the forum. Your ser. # shows to be around 1979-80 time frame. If it's marked 25-2 and hasn't been altered, then it should be .45ACP.
Without checking further or taking to someone that would know, if barrel is marked Model 1955 and cylinder is cut for moon clips, I'd say it's .45ACP.
ETA:
Can you post pics?
Last edited by jack the toad; 07-11-2017 at 06:02 PM.
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