KARLKAR,
I am very sorry for your loss! I can help identify this one as i used to own one. This is a hughes laser rangefinder ruby laser. When i was just starting to buy used laser equipment and tinker with it 20years ago, this was one of the first lasers i bought. it comes out of a military tank range finder. I did not have much experience under my belt yet and never made any progress with the project. I eventually put mine back on ebay for $200. I would be interested in carrying on with this project again and maybe actually getting it to lase this time!!