Old class 6x scope I am almost certain it was made for IMI by Hakko of Japan it was the standard scope in the 70-80's and replaced the kahles and wild scopes that were used it is very robust and basic scope, the elevation turret was set up for M-852 168 grain 7.62x51 ammunition and it should be ok for shooting it up to 800 meter in one revolution if I remember correctly if you want I can try and ask a friend from IMI if he has an operating manual
Any way I feel that the scope is an old fashion and a bit outdated for precision shooting
Good luck