I have one with 28" barrels and a non-selective trigger. The 1500 was basically a Perazzi copy and is the grandfather to the Keman KM-4 as well as a dead ringer of the AYA MD-2.
One of the older guys I shoot with had a few in the 70's that he shot pigeons with and according to him Perazzi parts could be fitted without to much problem when something broke or wore out.
I like the way mine points and swings. The wood is shaped well, the checkering decent, and the grain has nice contrast as well as layout for a strong stock.
These guns were built by the Aramberri company but unfortunately there's very little info out there. I read in Spanish Best that one of the actioners in one of the current Spanish high end builders is an Aramberri.
One thing is that if you get the 1500 and ever decide to get the barrels reblued they are soft soldered and require the slow rust process. I learned this the expensive way a few years ago
I hope this helps.