If the serial number is in the records, that will at least tell you the guage of the gun. You can narrow it down to within a few frame sizes based on that. Then do the rest with measurements. In theory, a given frame size should be around the same dimentions regardless of the guage. So for example, a No. 1 frame 16g. should have the same dimentions of a No. 1 frame 12g. But as Dean said, there is variation.
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B. Dudley
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