Black optical part with cap

The black optical part has a cylindrical body with ridged rings and is placed beside a removed round cap. Threads are visible on the body, with an embossed circular mark on the cap. The surface is scuffed and dirty in places; the optical part's working condition cannot be verified from the photograph.

Code: fo10029
Category: Photo, microscopes, optics
Subcategory: Darkroom
Width: 8 cm
Quantity: 2 pcs
Period: 1950s, 1960s
Material: Metal, Plastic
Colour: Black