A reader asked me a question a couple of weeks ago about the Calibre 185 (quartz)/ LWO 283 (automatic) duo of the 1980s. The movements use the same chronograph module, with one sitting on a quartz base and the other an automatic base. Here are the technical details of the pair The base of the LWO 283 is the ETA 2892-2 movement, upon which today's ETA 2892A2 and Sellita SW300 (i.e. Calibre 7) are both based. That movement was introduced in 1983. Interestingly, the origins of the 2892 go back to the Eterna-Matic 3000 of 1963 for which Eterna's movement business ETA, developed the Calibre 1466U. As I understand it, Lemania developed the 2000 module with Dubois Depraz, exclusively for Heuer. When Piaget/ Lemania took over Heuer, they changed the deal to allow Lemania to sell the movement more broadly. One place you'll find the DD2000 module? The original Audemars Piguet Royal Oak Offshore from 1993, which mounts the module on a JLC base.