Ah, yes! Not dumb at all Bill. That's how we learn........ It's the Instrument technical jargon for the Object Lens. That's the most forward of the lenses in the operating system.......unless you have a prismatic lens ahead of it, as in some of the pattern 18 scopes. The OG lens for the Scout Reg scope is the large lens at the front that always meets the ground first when you drop it ..........................ouch!
This is quite an interesting story in a roundabout way, being so famously associated with the No4T. Why don't you collectors/specialists get together and write up a small paper on the subject? Don't wory if there are many many mistakes. They'll soon be corrected and others will add to the story with their twopence worth and after a year or so, it'll be a good pretty well definitive tome.
Don't forget that the first person to read it immediately knows more than you because he knows ALL that you have written plus the little bit he knew before. But that's how we progress. I think it'd make an interesting read.