Part numbers: Omega GF 620-4 parts pages for the 320 and 321, with the 1968 changes. Omega prints no take-apart order for the 321: the hour recorder follows the order Omega gives for its successor, the 861, and the rest is normal bench order, the same as our 321 film. Numbers stamped on the parts are teaching labels; real 321 parts are not marked with them. Parts are drawn for teaching from the 321 film drawings, not to scale. Right-drag or two fingers to look around. T shows the tray. F is full screen.

THE BENCH

A full service on a vintage Omega Speedmaster calibre 321, from dial off: dial side, escapement, chronograph works and movement side, in the same order as our 321 film, into four trays. Then it all goes back, last out first in. Every part with its Omega number, and the 1968 changes flagged.

Learn shows every part, tool and number. Practise asks you to name the next part before it moves. Rounds after the first are Practise. Numbers stamped on the parts are teaching labels, not factory marks.

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