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A pic would help, but that sounds like a J-frame before the use of model numbers. Serial number 100xxx was made in 1956. The guns that would become the Models 36, 37, 38, 49 and 50 all shared serial numbers at that period, so more info or a pic would be necessary to tell which model it is.
The number on the crane and the adjacent frame is an assembly number.
Jim
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