I recently acquired a G grade Lefever with SN 17XXX. From Mr Elliott's book, this would have been around an 1892 gun. It has damascus barrels proof marked with (as well as - can describe) the 4 sectioned crown with a small plume on the top and a heavier base. It is encompassed by an oval. However, the stamp is worn and I can't tell what is under the crown or see the bottom half of the oval. Could anyone enlighten me a bit on this mark? I assume it to be belgian but that may even be wrong.