Some of the stamps on the barrel flats are as follows:
D = Damascus Barrels
4 (with superscript)1 = 4 lbs., 1 oz.
3 = Grade 3 or D Grade
1 on the bottom of the rear barrel lug = 1 frame or a light 12 gauge.
As for the 'checkering within the skeleton steel buttplate... someone with a knife decided to "enhance" the original checkering. It is not at all how that checkering would have originally been done.
That rust at the muzzles may clean up but first that rust must be neutralized ASAP.
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