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 (two 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
