Series V and VI Top to Bottom: Adapters, Retaining Rings and Lens Hoods.

With the silver ring (dual threaded retainer) above the hood two filters can be used. I have used 3 filters shooting B&W ... red or yellow, a haze and a polarizer.

 

The Series V is 30mm in diameter and the Series VI is 43mm in diameter. Between the two most popular shutter sizes used in the 19th Century.

 

The Series V fits my:

Kochmann-Korelle 3-4 c. 1931

Agfa Billy 0 (Zero) c. 1933

Agfa Super Silette-L c. 1956

Yashica-Mat TLR c. 1956

Yashica 635 TLR c. 1957

 

The Series VI fits my:

Agfa Record II c. 1950

 

Done