prairie ghost,
The rifle should have commercial proofs, unless made before early 1893 (unlikely). The bore diameter would be expressed in gauge measurement, and the date would be shown in the next number under the bore diameter as month and year (two digits for month and two for year, example, 0410= Apr 1910. You didn't tell the caliber, but if 8mm the bore diameter would be shown as 172.28, if made later than 1911, bore diameter would be shown in mm, i.e. 7.7 or 7.8 and the date would be the next four numbers. If this is confusing, post a photo of the proof marks and we can translate them for you.
Mike