- This 4" X 6" print of a Sikorsky HO3S1 helicopter has a military gray frame that measures 6.5" X 8.5". The HO3S1 was the first naval helicopter to see widespread service beginning it 1945 and through the Korean War. The frame comes with a drywall screw for mounting on a wall and a dowel for displaying on a shelf or desk. Handmade in the US by a Vietnam veteran owned company, it is a unique item for all aviation enthusiasts to display.