I think that's a great deal. Don't really know as I haven't priced them lately, but I hear they're high. I paid $425 for mine new, back in the eighties, but I'd never sell it, even if I sold all the others.
I'd say those sights gotta go, and would be reason to discount the price, but $750-$850 is starting to seem like a "good deal" on Delta Elites, these days.
I would estimate less than 500 rounds thru it, the inner parts are truely pristine.
I wonder how hard it would be to get some original sights for it??? Is the front sight original or after market. It looks original to me and it isn't dove tailed so how do you change it. The rear sight is dove tailed and should be easy enough to change.
That is definitely not the original. The original is a fixed 3-dot system and the front is staked on. Your trigger is not original either, but I'm sure you knew that. Here is original, except for grips.