Zodiac Aerospace Jet Accessory signifies that it was produced

signifies that it was produced for the European market

While more primitive and perhaps not as utilitarian as the more popular double pusher system (which Breitling developed in 1934)

would become widely available to ordinary citizens and be sold throughout the world

And as for Gruen

the Chronomat was meant to be used in peaceful pursuits

Zodiac Aerospace Jet Accessory signifies that it was producedThe emergence of transcontinental flights in the 1950s saw changing needs in wrist wear. For pilots who found themselves ferrying passengers across continental lines, conventional timepieces would no longer suffice. They needed a watch that could tell time in two time zones simultaneously. Although pocket watches with a GMT function did exist, they would prove impractical for the fast paced environs of an airplane cockpit. The most successful of these