The powerhouse of the Coppa Milano Sanremo is the 40 Jewel Lemania 283. It is fairly unique in modern mechanical watches because of its high jewel count, 25 jewels being the norn these days. The movement is based on the ETA 2892, fitted with a Dubois-Depraz chronograph module. One of the consequences of the module being placed on top of the base movement as opposed to an integrated watch and chronograph movement is that the chronograph buttons and the winding crown are not on the same level at the side of the watch.
The Dubois-Depraz chronograph module is used by a number of watch manufacturers in their "high end" products. It is utilized by among others, Audermars Piguet in their Royal Oak Offshore and Glashütte Chronograph and in their Royal Oak Offshore Chronograph, Girard Perregaux in their 7000 Chronograph (pictured below) and by Baume-et-Mercier in their Classic Chrono. Baume-et-Mercier refer to the movement both as a Lemania 283 and a B&M caliber 13283. The 30mm diametre of the movement has been widened from the standard 2892s 25,6 mm, so it is the exact same size as the Valjoux 7750. When introduced to the market, this caliber was marketed as a Lemania 283 A movement, the only movement Lemania ever marketed without producing it themselves. It is now formally a Dubois-Depraz caliber, and marketed as such.
The lemania 283 movement has the following technical specifications;- Friction Protection: 40 Jewels, Power reserve: 42 hours, Diameter: 30.00mm, Thickness: 6.50mm. Because the base ETA 2892 movement (which is recognised for it's accuracy and durability), operating at 28,800 pulsations/hour is using a Glucodur quality balance and an Nivarox #1 Hairspring the end result is one of the most reliable automatic movements on the market. One of the unusual things about the Lemania movement is that the date optic is part of the movement. It magnifies the date without the need for an unsightly bulge on the crystal or the distortion of the underside crystal optics.
The movement is an automatic assembly, the beat of which is very fast at 28,800 pulsations/hour and is almost inaudible. Conversely, when the watch is shaken, one distinguishes perfectly the noise from the winding rotor. The movement of the sweep hand is very smooth indeed and the precision "out of the box" is a few seconds per day. On some movements it is noticable that when the stopwatch module is activated there is a tendency for the sweep second hand to take a jump of about half a second. This is not so with the Lemania movement, which starts and stops very smoothly without any jump.
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Dr. Peter McClean Millar