This Winchester manufactured first variation receiver with two pin mounting holes in the lower tang and the word "Winchester" on the belly is for the model 37 single barrel shotgun in 410 bore and is in about very good condition exhibiting a mixture of added cold blue finish with a grayish brown patina. This is the only part on the model 37 shotgun that is tracked as a firearm therefore it will need to be transferred through a dealer. Receivers do not qualify as a C&R based on BATFE's guide lines.  (file photos)