The 1300 XTR series can all handle 3" shells. It came out in the late 1970s. Some of the 1200 series can't IIRC.
The 1200 series came out from 1964 - 1981 and the 1300 XTR series started in 1978. According to one resource, the 1300 XTR series is takedown.
Will look for more info if interested. Not too many interested in Winchester shotguns as opposed to Remington and Mossberg pumps.