The premium is in the "talking point". What premium is between the collectors and what value they put on such trivia. I think condition is more important.
1st and last do hold a little more if it can be verified. Usually these stay in house, or to manufacturers example store, or as presentation pieces. But make enough guns and then "another" gun for keeping is cash tied up and space, so often released.

Nice to have as a talking point. Does need some proof and provenance to justify though.