Proxi (repro?) device for Fed 1.

Hello,

I have received lately a proxi device for Fed 1.



It was certainly prewar made, when the "macro" 3,5/50mm Fed did not yet exist, so before 1938.
An interesting device, with an additional +2 lens which fits only the 3,5/50mm lens, and a very well made correcting finder with two optical parts. All that is connected to the rangefinder, of course. As to make correct photos with all that...🤔

Two other photos:


The "spectacle" logo shows that all that was certainly not directly made by Fed. But by whom?
I wonder too about the similitudes and differences with the "solid" macro lens. Same or different use? I don't know. Anyway, this device is coupled, not the "macro" lens...

Amitiés. Jacques.
Special note to Vlad: absolutely no problem with this new version of the site. And to insert an image is even easier. If I can do it...