See below, from the previous version of OnTheDash.

The Master time used three different mechanical movements (and of course one more for the quartz-powered ones).

At some point, we will restore this content about the dashboard timers to the current OnTheDash.

Jeff

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A summary history of the Master Time is as follows:

• 1933: Hervue 8-day clock (also marketed under the name "Hervue Junior") introduced as companion to the Autavia; powered by Revue Thommen GT movement (two-barrel); second hand at bottom of dial (6:00 o'clock); numerals 1 through 12 on dial

• next version of the dial has "Hervue" name above Heuer logo

• next version of the dial has Heuer logo above the words "8 days"; second hand remains at bottom of dial (6:00 o'clock)

• 1958: "Master Time" name above Heuer logo at top of dial; "8 Days" at bottom of dial; dial has numerals 3-6-9-12; Revue Thommen 63 movement; double-barrel; center seconds (thick second hand); hack feature

• early 1960's: Arogno 28 movement; single-barrel; center seconds (thinner second hand); hack feature

• 1968: dial has numerals 1 through 12

• 1968: GMT / 24-hour version introduced (hour hand makes one revolution in 24 hours)

• 1975/76: plastic case introduced

• 1981: quartz movement introduced

• 1985: Master Time discontinued