MJB44:
Your gun could be one of several models:
First Model Russian. Serial range 1 to 20000, manufactured 1871 to 1874.
Not likely, as guns for civilian sales began round serial number 6000.
Second Model Russian: Serial range 1 to 9000, manufactured 1873 to 1878. If a commercial gun the barrel will be stamped RUSSIAN MODEL or REISSUE July 25 1871. This will have a spur on the trigger guard.
Third Model Russian: Multiple serial ranges, one of 1 to 9000, manufactured 1874 to 1878. REISSUE patent date, trigger guard spur, large thumbscrew on topstrap.
New Model Number Three:
No spur on trigger guard. Short ejector housing. Manufactured 1878 to 1912. Jesse James was killed with serial number 3766 in 1882, which narrows your time period to 1878 to 1882.
Old Scratch:
You have a Model 10-7 .38 Military & Police manufactured in 1980.