1913-15 US Panama-Pacific Exposition Set Used Scott #397-404 Group

A used group of US Panama-Pacific Exposition commemoratives (1913-1915), including the 1c green Balboa, 2c carmine Pedro Miguel Locks, 5c blue Golden Gate, and 10c orange/orange-yellow Discovery of San Francisco Bay. Both perf 12 and perf 10 printings appear present, which accounts for the duplicate denominations. All sound and used with socked-on-the-nose to bar cancels; centering is mostly fine with a few better copies. Stamps are previously hinged, minor faults to be expected