Longines calibre 30L

This lovely gold Longines arrived recently for a touch of conservation and a full movement service. It dates from the early 1960’s and is powered by the Longines calibre 30L, which was available in a number of different grades. The 30L was the undecorated version, the higher grade the grade the more elaborate the decoration was (on both sides of the calibre) and they also utilised larger balance wheels. The top grade was the calibre 30Z which was used successfully in Observatory Chronometer testing.