Swiss eight day lever with calendar and center seconds Circa 1912

Silver eight day going pocket watch
–
A Swiss silver hunting cased eight day center seconds pocket watch with calendar and visible balance, London hallmarked (import) for 1912. The Hebdomas keyless eight day going movement with a club foot lever escapement and an uncut bimetallic balance with overcoil hairspring, the large mainspring barrel covering the back of the watch is marked 8 Jours Ancre – Quality Supereuer Garantie – Spiral Breguet Levees Visible – Swiss Made. White enamel dial with off center time indication featuring radial Arabic hours, an outer minute track, outermost Arabic five minute numerals and blued steel hands, silver decoration above and below, subsidiary dials for the date and days of the week, a gilt, finely engraved bridge on the left over a polished steel regulator and visible balance. A case with decoratively engraved covers on both sides, the front with a vacant shield shaped cartouche and maker’s mark G.G.G. in a rectangle. Dial signed Jours Hebdomas.
–
Diameter: 50 mm
–
Signed: No name
–
The name Hebdomas is derived from the Ancient Greek word for week/the seventh day. It refers to the watch’s ability to run for at least a week on a single winding.

A Hebdomas pocket watch is a timepiece known for its eight day, hand wound movement, off center time indication and a visible balance wheel mounted to a dial side bridge, a feature that makes Hebdomas watches instantly recognizable, and is typically gilded and engraved with a decorative floral motif. A massive mainspring barrel covers the entire diameter of the movement, rotating around the center similar to an automatic rotor.

Most Hebdomas watches feature the name centered in the dial and 8 Jours engraved on either side of the balance. Mostly also featuring a flower or arrow design above.