depends of model. bottom of butt. Side of frame. Inside cylinder housing, on frame. sometimes under grips..................
depends on the model revolver. single action just in front of trigger guard............modern revolver bottom of butt............
Do an internet search.
There's a little blue pocket-sized book, "Colts Date of Manufacture: 1837-1978" by R.L. Wilson that has serial numbers listed by model and date. Very handy. The information in the book shows up on...
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