Details of Omega's New Original Calibre 321 (with Live Pictures) - Revolution Watch
Omega Releases First New Calibre 321 Speedmaster Model In Steel, Referencing The Legendary 'Ed White' | aBlogtoWatch
Omega's Caliber 321: The History And Comeback Of A Legend
The Omega Speedmaster Calibre 321 - Q&A with Federico Nolfi - Horbiter® is the Italian magazine dedicated to watches. News, reviews, and information on the best watch brands and the watch industry.
OMEGA Calibre 321 Chronograph: The Rebirth of The Very First Speedmaster | Swisswatches Magazine
The History of the Omega 321 caliber - Vintage Omega Watches | Vintage Masters