External optical finder. Pictured above is an Optical Bright-Line viewfinder for 50mm (or 5cm) lenses such as the Elmar 5cm, catalog number for the viewfinder is 12015 or SBOOI as it is better known.

External rangefinder for Leica Ig or If models, Chrome Finish, catalog number 14011 also known as FOKOS. This is a later model vertical mounting FOKOS, the earlier models designed for cameras like the Model E (Standard) mounted on the camera horizontally, however the swivel mounting foot often gets lost off the earlier type.

The vertical type mounts directly to the camera without the need of a mounting foot. You could originally order the FOKOS with focus scales in iterations of either feet or meters, depending on your market.