Massive Gauss Type Lens to be identified !

[ausphoto]

intriguing ideas regarding the holes in the mount

 

[AgX]

One possibility that seems not to have been mentioned is that the holes were added for a special purpose, unrelated to the original application.

Interesting idea. But in that case the lining of the holes would either be of blank metal or (re-)enamelled.

 

[ausphoto]

only if it were a one-of-a-kind, which I don't think it is....still looking...