We were commissioned to make ten 4 inch diameter medallions commemorating Pan Am’s first trans-Pacific mail flight. Our ‘master’ was built from a variety of materials and was based on the design of the US postal Service’s cancellation stamp from that first airmail shipment. The master was made as large as a dinner-plate and was reduced on a pantograph engraving tool by Jurgen at Frank Bonigut Engraving, Richmond Hill, Ontario. The final bronze castings were presented to generous donors to the San Francisco Aeronautical Society.
Here’s a close-up: the billows of the sails was imposed on the thin styrene plastic by pressure from my thumbnail.