Calibre 284 — a short run in 1957-58

In brief

Production ran for barely two years, 1957 to 1958, with the 30T2 family already close to the end of its commercial life. Mechanically the 284 holds the centre-seconds line: 17 jewels, 18,000 vph.

Short history

It falls in the closing stretch of the 28x series, and its production run is documented as an unusually short one within the family catalogue. It is also one of the few calibres here with a verified movement photograph, which shows the finishing typical of this late generation of the centre-seconds branch.

Watches that used it

• Omega dress watches, late 1950s