Yes, great find! I believe that the boat is UB-148 not 67 due to the agreeing resources and the fact that UB-67 was a Mediterranean boat and didn't leave until 1922 when she was "broken up" at Swansea. Apparently, the original photo was stamped "
UB-148 at sea, on her way to the United States of America, circa 1919, with Lt. Comdr. Harold T. Smith in command, after having been surrendered to the United States Navy, at Harwich, England." Those don't look like Mediterranean seas to me. Thanks again everyone, we came across a lot more information that I expected! 