The factory would have called it a Model of 1902 M&P, due to the round butt. The serial number fits known guns in the 1911-12 era. I don't know if the factory stamped an N for nickel that early on the left side of the grip frame or back of cylinder but you might look. Nice gun.
Below is a box of Winchester ammo which might have been sold along with the gun when it was new. This label pattern indicates 1908-13.
Ed