Vintage and from an estate sale.
 
Marked Imperial Prov. USA.  Main blade also etched "Diamond Edge 852DE"
 
Condition:  Both blades open as they should.  The handles are perfectly aged / worn giving it a great aged patina.  Very little snap left.  Both blades are in good shape.  The etching can still be seen on the main blade even though it is hard to see in the pictures.
 
2 3/4" when closed.  Double blade.  
 
Location E2