If the gun is an Ithaca/SKB and has ejectors it is at least a model 150, not many of those so probably a 280. There are a few that were purpose built as quail guns, 25" barrels choked IC/IC. Look at the barrel flats. 25" barrels will be IC/IC or IC/MOD. 28" were MOD/FULL. If the Ray-Bar sight is still aboard the barrels are probably uncut. Replacement barrels will be very hard to find. If its an un molested 280 in great shape-1k or less.