In the early seventies, digital technics came into visibly our life.
Pocket calculators with digital display promised precision and power,
electronic digital watches formerly unknown rates.
Instead of the unsharp "almost half past seven", you could tell precisely
"7:28 o'clock and 57 seconds". The fact, that digital watches
are absolutely unusable, when you have to deal quickly with
time frames, was discovered later. This was the reason, why
digital watches soon disappeared from the wrists - except from
those of mathematicans and computer scientists ;-)
The digital technics had a big disadvantage: It was too expensive for the
consumers. And because of that and the fact, that people were longing
for digital "precision", mechanical watches with digital displays came
onto the market. These constructions were known long before, but hardly
used, but now, digital watches were simply "in".
A mechanical digital watch, regardless, whether powered by a good PUW
movement or simpler EB pin-lever movements, were "in" and sold
in many different shapes, colors and variants. They all had one
thing in common: A bulky case and a small "dial".
On simple digital watches, the hours were changing slowly between the
minutes 55 and zero, on better watches like this caravelle,
it jumped at - more or less (it wasn't a Rolex Datejust) -
The movement was produced by the Pforzheimer Uhrenwerke (PUW). The
caliber 1561 marked the peak and the termination of the movement fabrication
in Pforzheim. In terms of reliability and power, it was at least as good
as swiss movements at that time. The very well purring rotor (which was
encoupled when you manually wound the watch) sounds still perfect and offers
a contrast to the modern, cheap sounding ETA movements.
Of course, the Caravelle Digital was water protected, too, but
since the back was only pressed and the crown is moving very easyily,
I wouldn't trust it. Despite that, for diving, a digital watch is not
the right too, since it is lousy readable.