Hard to find!  Good chance for a collector.
 
Antique / vintage pocket knife.  Black scales double blade with swell end.  
 
Marked Sheffield England, Brit Pat, etc.
 
3 1/8" long when closed.
 
Snap left on both blades.  Both blades open and close.  Some shrinkage on scale material.  Bolsters are in good shape.  Should clean up nicely if wanted.  SEE PICTURES.
 
Location D2-13