Stainless steel and 18 ct gold Bezel without diamonds The following collections feature stainless steel and 18 ct gold without diamonds : Longines PrimaLuna Conquest Classic The Longines Elegant Collection The Longines Master Collection (Exception: The Longines Master Collection L2.128.5 in size 25.50 mm) The Longines Saint-Imier Collection Gold cap 200 μm minimum Stainless steel Gold cap Outside ingrave markings: Stainless steel Back of the case and folding clasp 1 GC200 / Stainless steel (Gold cap 200 microns) 3 Responsibility mark LONGINES 1 3 1 3 Stainless steel and 18 ct gold Bezel with diamonds The following collections feature stainless steel and 18 ct gold with diamonds bezel : Longines PrimaLuna Longines DolceVita Conquest Classic The Longines Elegant Collection The Longines Saint-Imier Collection Diamonds 18 carat gold Gold cap Outside ingrave markings: Stainless steel Back of the case and folding clasp 2 Stainless steel / Au 750 3 Responsibility mark LONGINES Bracelet construction: 2 A The central part of a link is made out of 316L stainless steel 3 B It is wrapped in a 18ct gold cap of a minimum thickness of 0.2 mm. A B Stainless steel and 18 ct gold Crown in solid gold The crown is considered to be part of the movement, not of the case. As a result, the appropriate marking of the case back is “ALL STAINLESS STEEL”. Gold How to identify the gold used in a Longines watch 1. Standard of fineness This indicates the proportion of a pure precious metal contained in ON THE CASE-BACK AND THE BRACELET an alloy. It is expressed in thousands, e.g. 750/1000, or in carats in the case of gold, e.g. 18 carats, 24 carats being 100 % gold. 2. Logotype of the manufacturer For example, the hammer is the collective responsibility mark for manufacturers of watch-cases in the Jura. 3. Swiss assay mark Every watch-case made of gold, silver, platinum or palladium sold in Switzerland has to be officially assayed and hallmarked. A single 8 official hallmark was adopted in 1995 – the St. Bernard head. 5 1 4. Common control mark 3 Hallmark of the multilateral convention on the control and hallmarking of objects made of precious metals (Vienna Convention). 4 3 7 4 5. Responsibility mark 6 2 6. Standard of fineness 7. Serial number Individual number allotted to each watch manufactured in the Longines workshops. ON THE INSIDE BACK COVER OF THE CASE 8. Reference number Reference number of the watch-case. 9. The watch Reference number (internal Longines number). 1 2 10 9 10. Thickness of the case 4/10 indicates that the thickness of the case-back is at least 11 four tenths of a millimeter. 11. The calibre Reference number of the calibre used in the watch..