Large Mystery Rifle Bolt

Description

This item is an estate sale item.  As such I have no history on it.  I have for sale what appears to be a large rifle bolt.  It is of unknown origin.  It has a fixed firing 'pin'.  It has a moving extractor pawl.  It is 5.75" OAL X 1.25" diameter at face.  A U.S. quarter dollar is shown in the photos for size reference.  I have no idea what kind of rifle this bolt came from.  It is being sold as-is.  Please ask any questions you may have.