N15521 Stearman Hammond Y-1S Private Unknown, USA Dave Welch Collection - 1960
N15533 Stearman Hammond Y-1S National Air and Space Museum (USA) Silver Hill, NASM Restoration Centre, USA - Maryland Brian Bickers - 08/1987
N15525 Stearman Hammond Y-1S Private Van Sant (9N1), USA - Pennsylvania george baczkowski - 08/1968
N15525 Stearman Hammond Y-1S Private Van Sant (9N1), USA - Pennsylvania george baczkowski - 07/1968
