I just aquired an Odd Krag Action with the serial number of 85621 and the date of 1909 on the ring which is of 2 diameters. There is also a couple of Crest Marks and a proof mark or two. The side plate does not have a screw to retain it and the receiver is scalloped out on the left and the loading box is stepped down by the wing. Any idea what it may be?