Really Right Stuff B69 lens mount_Leica Thread Mount but this is a good

but this is a good "user" example if you don't mind the aforementioned quirks

The Zeiss-Ikon 517/16 is a compact folding camera that shoots 6x6cm exposures on 120 rollfilm

with some internal dust and haze

4 scrims (single & double for each fresnel)

This OM-4 is in decent cosmetic condition

Really Right Stuff B69 lens mount_Leica Thread Mount but this is a goodThe Really Right Stuff B69 plate is designed for the Nikon 80 200mm f2. 8D ED lens (and its corresponding foot). Please note that this is not a full lens collar, it is an Arca compatible plate designed to mount securely to the foot of the existing lens collar (which is not included). Minor cosmetic wear. Camera mounting screw is 1 4" 20 threaded.