This is a very nice Pre-War Zeiss Ikon A42 Push-On G3 Yellow Contrast Filter
For Contax/Nikon Rangefinder Cameras lenses with 40.5mm filter threads
(including 5cm f2.0 & 1.5 Sonnar/Tessar, Nikon 50mm f2.0, 135mm, etc..)
Made in Germany
All these early Zeiss Filters have the Zeiss Ikon logo beautifully marked in the edge of the glass.
I tried to show it in the picture.
Glass is in beautiful condition
Fits on perfectly & snug
Will Come in a Protective Filter Case!
*shown on Contax II Zeiss 5cm f2.0 Tessar lens, which is not included
Actual picture of item listed.