Front protective cap for lens "Jupiter-3"
for 42mm lens front, plastic
"ZOMZ" plant, USSR

Very good condition. Cap has small signs of age and use.
Lenses "Jupiter-3" and "Jupiter-8", camera "Zorki-4" are not included and shown as an example of mount.

Please note, that this cap does not have carving, spring or anything; it's fixed at the lens with friction force only. Fixation depends on cap and lens condition, sometimes a specific cap is not fixed properly at a specific lens. Offered cap is fixed at my lenses "Jupiter-3", "Jupiter-8"  and "Industar-61L/D" properly and most likely will be fixed properly at any lens with proper condition of the front part. 
I do not guarantee that it will be fixed properly at your lens.

Material: plastic
Size (diameter*thickness): 46 mm*8 mm
To fit lens front - 42 mm
Weight - 5 g