Winchester Model 37, 16 ga. single shot shotgun.  NSN.  Excellent condition.  28" plain barrel with bright shiny bore and 99% blue.  2 3/4" chamber with fixed full choke.  Receiver in also in beautiful shape with 99% blue.  Stock and forearm have very good original finish with a few light handling marks.  Original Winchester butt plate is in great condition.  Gun locks up tightly and external hammer and trigger function fine.  Circa mid 1950s and a great example.  The Cadillac of single shots!