Definitely looks clean! Unfired… perhaps. A few good places to look that might give evidence either direction:
—Top down where the hammer bounces off the frame with each shot as the slide cocks the hammer. This typically leaves a slight ding on the frame — not harmful, but evidence that doesn’t get removed and also doesn’t get replicated without live fire
—take down or more accurately, re-assembly marks on the rear of the slide. When any 1-2-3rd Gen is reassembled after a field strip, the novice and ham-fisted will ding the rear of the slide especially with the ejector (left side of firing pin) and the decocker (right side). So this doesn’t show wear per se, but it shows handling
—on the frame when you do field strip, the black frame very very very quickly shows some wear from the reciprocating slide. Hard to judge how much use, but still worth a look
The Model 915 is a great gun, but perhaps it’s “cheapest” feature is it’s finish. That black finish is very low on the durability scale. It’s safe to say that yours was definitely never carried in a holster and makes a fine argument for hardly if ever used. The finish on these looks good to my eye but it is the antithesis of “durable.”
I’ve had three, down to one currently. These are good guns. Their three digit model number has confused quite possibly 95% of anyone who is vaguely familiar with the S&W model numbering system.

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Based on your suggestions, this is an unfired 915.