This Industar was made in 1964 only, in a very limited number.
The optical part was possibly a trial before Fed used it on their own cameras. Probably it is the first Russian lens to be made with lanthanum coating. It's unclear why some lenses have a red "L" (for lanthanum), others have not.
The body itself is original and cannot be seen on any other lens.
Known serial numbers:
64073 _____ without "L" ________ seen on the net.
64502 _____ without "L" ________ seen on the net.
64583 _____ with "L" ___________ geoffox23
64589 _____ without "L" ________ seen on the net.
64676 _____ ? ___________ seen on the net.
64712 _____ ? ___________ seen on the net.
641153 ____ with "L" ___________ seen on the net.
641176 ____ without "L" ________ Jacques.