The Heuer Digital Era
Collectors often reflect on the 1970s as being the most dynamic decade in Heuer’s history, a case that’s easy to mount when you look at the combination of the ground-breaking Chronomatic movement and a roll-call of famous names- Monaco, Carrera, Autavia, Silverstone and Montreal, to name but a few. The other reason that the 1970s stands out is that at the same time as Heuer was developing innovative mechanical chronographs, it was also at the forefront of high-precision digital quartz technology.
The Heuer digital era lasted only seven short years (1975-1982), but during this time there were some incredible watches launched. Back in 1975 it must have seemed that digital technology would be the next wave of watchmaking- and Jack Heuer had no intentions of seeing Heuer left behind in the digital race.
The first generation of Heuer digital watches uses a series of movements developed by Heuer in conjunction with its partners in Silicon Valley, and is comprised of:
- Calibre 100: LCD/ LED Chronograph
- Calibre 101: LCD, single display; time and date only
- Calibre 102: LCD/ LCD Chronograph
- Calibre 103: LCD/ LCD Chronograph (Ford RS)
- Calibre 104: LCD GMT (Manhattan)
- Calibre 105: LCD Chronograph
- Calibre 106: LCD Chronograph version of Calibre 101
- Calibre 107: LCD GMT (Senator)
The most technically innovative of the movements is the Calibre 100/ 102- the first solid-state digital wrist Chronograph ever made. The Calibre is made up of two separate chips driven by a single 32kHz crystal on a common circuit board (as you can see in the photo above).
The chips were initially made by a US company called Integrated Display Systems (IDS), with Heuer developing its own capability in 1977 when it created a specialist Microchip company called Heuer Micro-Technik SA (HMT).
What’s also obvious from the photo of the Calibre 102 is the fragility of the movement, most notably the exposed thin wires connected to the two chips…only one of these wires had to break for the watch to lose functionality, which explains why so few Chronosplits survive today.
This vulnerability was partly addressed on later movements, such as the Calibre 105 below, which provided better protection to the chips. There are very, very few people who know how to service and repair these movements today, and it’s certainly not something to try at home. The outstanding website Led-forever has some great information on these watches- certainly worth a read.