This is the 1948 US Hunting Permit (Duck Stamp), Scott Catalog #RW15.  It is inscribed "Void after June 30, 1949".  The stamp is in mint condition with gum, never hinged, and is a plate number single.  There is some slight gum disturbance near the top of the plate number, possibly caused by light moisture from a showguard mount.  This is visible in the front and back views of the stamp, but the stamp itself has no gum disturbance.  The 2015 Scott Catalog value was $55; we are offering it at 35% off catalog value.