My uncle recently decided to move out of the country and I purchased all of his guns. Included in the group was a gun he gave me that belonged to my grandfather. He brought it back from WWII. It is a side by side cape gun in 16g x unknown rifle bore. I have read that there should be markings telling me the guage and caliber but I can't find any. The name on the barrel is E.F. BUCHEL IN MEHLIS. Any info you can provide would be appreciated.