Dating gruen watches
Various extra features, called "complications", such as moon-phase displays and the different types of tourbillon, are sometimes included.Modern watches often display the day, date, month and year, and electronic watches may have many other functions.In this example, two such movements have been housed in a single case to provide a watch with two independently adjustable time zones.With thanks to Paul Groom for the use if his picture.: Swiss made, 15 jewels, micrometer adjustable balance, circa 1940's.Association a but non lucratif basée à Maastricht qui a pour but de rassembler toutes personnes intéressés par les instruments d’horlogerie ancienne et les baromêtres. Il Web site principale per l'orologio, per collettori, restauratori e commercianti antichi universalmente.This page uses frames, but your browser doesn't support them.The Bulova Accutron was the world's first electronic wristwatch movement, utilising the high frequency vibrations of a tiny "tuning fork" rather than the oscillations of a mechanical balance wheel to regulate timing.: Swiss made, 15 jewels, manual wind, circa 1940'/1950's.
Kostenloze informatie over historische uurwerk en instrumentmakers.De Horological Foundation is een stichting zonder winstdoeleinden, ze beoogd d.m.v.haar website een platform te zijn voor eenieder die geinteresseerd is in belangrijke antieke klokken, horloges, barometers en instrumenten.This example is from a Zenith HS3 pocket watch issued to the Royal Navy's Hydrographic Service during the Second World War.It is apparently based on a movement used in pocket watches issued to the Royal Flying Corps during the First World War (see below).