This Winchester manufactured 28" long barrel in 16 gauge with a 2 3/4" chamber, fixed factory full choke, and a bright, excellent bore is for the model 37 single barrel shotgun and is in very good condition exhibiting a mostly brown patina with thinning original blue finish in protected areas and possibly having a few scattered specks of surface rust. The front sight bead and complete extractor assembly are included. This barrel has the first variation barrel markings.  (file photos)