Graflex optical viewfinder with No. 4 mask. The number 4 mask is for use with 4x5 and 3 1/4 X 4 1/4 inch cameras but the viewfinder itself will work for all Graflex press camera formats. This is the longer of the two viewfinder versions. For use with Speed Graphic, Crown Graphic and Century Graphic cameras. There are some cleaning marks on the front glass. These can be taken apart and cleaned on the inside by removing the two screws that hold the front lens holder on. The finder shows wear consistent with its age and normal use