Info on bore sight / telescope needed

Howdy !
After a couple months of watching this sight, I finally decided to join and ask for help!

I have a 1927 MK-36 MOD-0 SER NO 185
It's a bore sight telescope for a 6" gun. On the side of the crate it reads - COND R-2 - Does anyone out there know where I can research what ship, if any, this was assigned to and also what the ( COND R-2 ) stands for?
Also, I haven't been able to find any info on the possible value.

Any help would be greatly appreciated!!