For the price, why not ... you might shoot it better than your primary pair.
Besides, two shotguns is barely a start ... let's see, there's Trap, Skeet. Sporting, Upland, & Waterfowl just to form the basic 5 ... from there you can specialize: Trench, 5-Stand, FITASC, Internationbal Skeet, Grouse & Woodcock, Quail, Pheasant, Dove, Goose, all Skeet gauges, different action types, i.e., boxlock, sidelock, O/U, SxS, Pumps, Semi's, Singles, straight stock or pistol grip, splinter scnabel or beavertail , etc. etc.
All kidding aside, the Itahaca's are good solid guns and that's a very respectable price if indeed it is a mint condition SKB 600. I recal breaking a lot of clay targets with one of those years ago. Let's just hope it's at least
a 28-incher !