Back in the late 70s & early 80s if you had the cash, the S&W custom shop would do all kinds of special requests. If you had the cast to pay for a couple hundred guns up front, you could get nearly any variation you wanted.
I friend of mine had one of the Lew Horton specials, a 3" Model 29, round butt (I think it was a 29-2, but am no longer certain, it was mid 80s when he got it, second or third hand).
The name Jovino rings a bell, but I don't recall where...
your gun may have been an individual custom, or it may have been from a limited run of specials for some distributor. It is also remotely possible it was done by a custom gunsmith. Sorry, not much help.
one thing does make me curious. It might just be the angle of the picture, but it looks like the muzzle is very square cut. No S&W I ever saw had a flat crown muzzle factory barrel, which is what that picture makes me think it has.
If/When you go to look at the gun, look at the muzzle. If it is crowned flat (no radius to the edge of the barrel), then I'd say someone other than S&W did something to the barrel. While that doesn't harm the value as a working gun, it does affect what one ought to be willing to pay for it.
Place a call to S&W, for a fee(it used to be $35 but that was a long time ago) they will prepare a letter stating what the condition of the gun (ser#NXXXXXX) was when it left the factory (barrel length, what features it had, etc.).
That will tell you if it was a custom order gun or if it has been customized aftermarket.
With the price of standard 29-2s being what it currently is, $1000 for a "rare" one, in Europe, isn't hugely out of line, but no bargain. However, if the gun is a custom job from some unknown gunsmith shop (no matter how good the work), its not worth the same to a collector as one original from S&W. So the value would be comparable to any standard gun in similar condition, perhaps worth a small premium more to someone with a strong desire for that short barrel, or perhaps not worth quite as much to someone else, because of the short barrel.
Contact S&W, find out what it was when they sent it out the door, and then, go from there. Or just buy it, and if you later find out that you paid more than you had to, say, "oh well", and go on with life...and think about how much more the asking price is likely to be the next time you see one of those for sale. Odds are, it will be more than what they are asking today...