Your revolver is a Colt m1877 Lingtning in .38 Colt or m1877 Thunderer in .41 Colt. They are the same gun, just in different calibers. I you would provide the serialnumber we can give you a date of manufacture also. You donĀ“t have to provide the entire number, for instance 444XX would suffice.
Regards!
Anders Olsson
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