This scope is from a lady I work with whose husband as passed away. I'm trying to help out.

I think this was purchased new in the '90s. Best I can tell it has never been mounted, as there is no indication of any ring marks or smudge or paint distortions that I can see. There is a small nick I found on one of the knob covers and I was able to photo it. These are expensive scopes (in my book anyway) and north of $1k from what I have seen.

As stated in the title it is 2.5-10 x 42 with a 30mm tube. It has a ranging card in the box and some papers that appear to be printed from a home computer with the specs.

My photo with my phone through the scope DOES NOT in any way represent the quality of the optics as they are as sharp and clear as any I have looked through. There's no noticeable distortion at the edges, I was trying to show the reticle in the photo.

Looking for $650 shipped.
Hopefully the photos can answer some of your questions, if you have others let me know and I will try to answer best I can.

I found this review over at snipercountry

Review of IOR 2.5-10x42

Be Safe,