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Stopwatch HEUER ref. 924

Vintage HEUER S.A.V.I.C stopwatch ref. 924 decimal hour with flyback function --- close-up shot ---

The ref. 924 : a decimal hour stopwatch for industrial purpose

Throughout the history of industry , engineers have sought to improve productivity, maximise gains and reduce costs. Faster and organised you are, bigger money you’ll make !

To optimize worker efficiency, work measurement methods, known as PMTS (for Predetermined motion time systems ) [1] were developped. Simple tasks executed by operators are timed and analyzed. PMTS systemd (like the MTM for Methods-Times Measurement[2][3]) uses one hour decimal division as time unit. Like decimal minute, these units are easier to manipulate for mathematical operations than seconds.

The HEUER ref. 924 stopwatch is designed for these applications. External scale of the recorder is divided in 100 ten-thousandth of hour. The register is divided in 30 thousandth of hour.

[1] see wikipedia
[2] see wikipedia
[3] see

Technical informations



Full designation

HEUER ref. 924 – Decimal hour – S.A.V.I.C version


  • start, stop by crown
  • reset and instantaneous restart (flyback) by left pusher

Recorder and register

  • 1/10000em hour recorder (long black hand makes one revolution in 36 seconds)
  • small 0-0.3 hour register (small hand makes one revolution in 18 minutes)




  • 7 jewels
  • unbreakable mainspring
  • antimagnetic
  • shockprotected


53mm without the crown