This reference is also called Ed White by collectors because this is the Speedmaster reference that was used during the first EVA (Extra Vehicular Activity), or Space Walk, made by the astronaut Ed White during the Gemini 4 mission on June 3, 1965. The watch does not have the Professional title on the dial and features straight lugs. Produced for only a year and weirdly featuring SC in the caseback as well as attractive Alpha hands, these are sought after by Omega collectors.