Horology

24-hour faces

-- wristwatches --

Stocker & Yale P650 military

Universal Genève Tri-Compax

Yema «Bipôle Duopoly»

-- clocks --

Greenwich Obs. Shepherd

The very early Universal Genève Tri-Compax is the object of my affection. (You will see an 1960s model, but only to demonstrate why I focus on the earlier ones :-)

The Tri-Compax is a tripledate moonphase chronograph. It's the moonphase dial that's the most distinctive part of the Tri-Compax face. The disc therein, sporting a painted facsimile of the moon, makes one revolution each 29 days; a lunar month.

What could be more attractive and powerful than having the entire cosmos on one's wrist?

The Tri-Compax has a 17-jewel signed manual wind calendar/chronograph movement (cal. 287), round snap back case (the watch comes in a variety of widths), a satin painted numeral dial, and four registers; constant seconds, 30-minute and 12-hour recorders, date, apertures for month, day, and phases of the moon, chronograph sweep seconds, dial calibrated for tachymetre.

Here are some variants on the Tri-Compax:

Stainless Steel, English	Stainless Steel, luminescent hands
Stainless Steel, Spanish	Black face, Spanish
Pink Gold, Thai	18 K, Thai
18 K	18 K, movement

In comparison, here are some predecessor (and one ancestor) watches:

Compax	Aero-Compax
Aero-Compax, Roman numerals	Aero-Compax, 1960s

Some date information gratefully taken from the company web site.