How much is a antique viewfinder worth?

Answer 1

While waist-level viewfinders have been common in box cameras since the beginning of the 20th Century, large viewfinders of the sort that are suitable for ttv Photography became popular in the late 1920s and 1930s with medium format TLR and pseudo TLR cameras such as the Rolleiflex and the Voigtländer Brillant. Similar large, clear square viewfinders were popluar in TLRs and pseudo TLRs until the mid-1960s. These medium format cameras became less popular with the advent of 35mm SLRs and compact cameras in the 1960s and 1970s.

Answer 2

antique view finder