Helbros Pilot's Watch
Hebdomas military watch from the 1930's. Beveled edge glass crystal with rotating bezel marker. Original luminous dial and hands with even patina. Signed hinge case and caliber 82A 17 jewel movement. Measures 37 mm across chrome plated case. Impressively worn Hebdomas 1930's pilot's wristwatch.
The Latin word meaning the number 'seven' a week; seven days or the seventh day. These handsome pieces have the novelty of running 8 days with an open balance wheel and balance cock. The watch was made by the Swiss company Schild & Cie (not to be mistaken for Ebauche maker A. Schild & Cie). But the history of these unique watches goes back further indeed to 1888. The history of these timepieces with Arthur Graizely who bought an 1888 patent for an 8 day watch from Irenee Aubry. She was granted this patent in 1889, and it was purchased by Graizely, who founded the firm Graizely Freres (and brothers) and started production. Actually the watch patent was meant to run for 15 days but runs only for 8 days and therefore was given the name 'Hebdomas'. In 1893 the firm won Gold medals in Chicago, in Geneva 1896, Paris 1900 and Milan 1906 - These medals or accolades can be seen boldly on the back movement. In 1915 the company was reorganized as Schild & Cie and the patents and trademarks were transferred from Graizely & Cie. Schild continued to produce these pocket eight day watches in a wide variety of shapes and designs alarms, then wrist versions.