With Patek Philippe Extract from the Archives confirming production of the present watch with steel bracelet in 1960 and its subsequent sale on 17 February 1961.
Reference 3418 was introduced into the market in 1958, the same year as the calibre 12'''400 movement. This ingenious model was designed to allow the easy change of the leather strap for a metal version by unscrewing a metal ring fixed onto the case back and revealing the lugs, hence its designation "convertible".
To the best of our knowledge, the present watch has never been offered in public before. It is furthermore preserved in very good, original overall condition.