I have a Remington 1903 and they are stamped "U.S. Remington" on the receiver. You state it is Mauser style. The 03 is a LOT closer to a Mauser than the 1917 (which happens to be my favorite Military rifle). Easy way to tell even without pics...where is the safety? If it is a "rocker" on the right side of the receiver, it's a 1917. If it is mounted on the rear of the bolt cocking piece (mauser style), it's a 1903. The 03 is a copy of the Mauser, the P14/1917 has some features (stripper clip, extractor, ejector etc..), but definitely a different rifle
The 03 also has a magazine cut off on the left side marked "on/off"