General Eisenhower with a German over-under combination rifle/shotgun with a scope, General Omar Bradley looks on, Europe, WW2, 1945

That is called Drilling rifle. It is a double barrel shotgun with a rifle barrel under the shotgun. Technically not an over under. That one might be the M30 issued to German fighter pilots but I can not tell form the picture. https://en.wikipedia.org/wiki/M30_Luftwaffe_Drilling Now that I have downloaded the picture and blew it up I can see it not the M30. I have several Drillings in my collection but they are all hammer guns.