Yes Sir!
Looking Good Indeed!
The Sight that was mounted on the Right side of the M68, at least from "84-87", was the M105D Telescope...
We used it in a couple ways:
This was the Fall Back Sight if we lost Power, the Computer or Laser Rangefinder.
You index Lead and Elevation/Range manually using Hash Marks built into the sight.
Also used for Snap Shot or Bore Sight Engagements.
When firing from Defilade positions.
The Gunner would look through the 105D as the Driver pulled Up into Firing position.
At the sane time the Loader would look through the Open Breach down the Gun Tube to make sure the Shot will clear the Burm.
Once clear, the Loader loads the requested Round Type and the Gunner would Stop the Driver.
The Gunner would then use the 105D to engage the target.
On the M60 in general.
Here is an interesting link:
http://www.tank-net.com/forums/?showtopic=35414
-gus