Hello and welcome to the Forum.
With that serial number, it probably shipped in 1972. If the hammer is fully exposed and has a spur, it is a Model 37. If it has the hump back and the hammer is mostly enclosed, it would be Model 38. Just open the cylinder and look on the frame in the yoke cutout. The model number is probably there.
Jack
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Jack
SWCA #2475, SWHF #318
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