This Winchester manufactured 28" long plain barrel with a fixed modified choke and a very good bore is for the model 1897 slide action shotgun in 16 gauge with a 2 3/4" chamber and is in very good condition exhibiting a brownish gray patina with traces of original blue finish in protected areas and a few scratches present.  (file photos)

Note: Winchester model 1897 / 97 slide action shotguns with the following serial numbers have been observed with this barrel:

16 Gauge: 894353