100-300
The manufacturer is normally stamped on the firearm next to the model, caliber, and serial number.
By model, caliber and serial number.
There is no model number. The model name is Cobra. Are you talking about the serial number?
Virtually impossible to determine caliber by just the serial number.
No such S&W model number.
No way to know the caliber from just the serial number
Model numbers were not used before @ 1957.
Model 581.
Are you sure of the model number?
Impossible to answer without knowing what caliber it it.
Basically impossible to do with just the serial number.
What markings are present on the revolvoer? Is it a top break or does the cylinder swing out for loading? on top by the cylinder there is a hinge, the tip of the barrel swings upwards