This is a very old (pre-war??) Wratten (Kodak) push-on filter set ideal for use on Zeiss Sonnar 50 and Biogon 35, in particular pre-war black nickel Sonnar 50 and 135 with no filter thread. All in original box and with two manual. All filters are in the size of Series 6 so you can put any Series 6 filter in the holder. The clear on is a diffuser with a special pattern as shown.