It is not immediately obvious what sets this early execution chronograph wristwatch apart from its later peers; the reader could be forgiven for thinking at first glance that this is a timepiece with all the standard components that a Valjoux 72 Carrera reference 2447S might have. Namely, the elegant 36mm diameter case, elegant faceted lugs and a one step case back. However, the dial is a delicate matt eggshell white and not like in the later models with a starburst silver finish, which was more common and ran for a longer timeframe. Jack Heuer set out to create the most unfussy tool watches he could but without compromising on design. Heuer and Singer the dial maker tested a variety of finishes and it may be that the "eggshell" white finish was simply too delicate for heavy use. The very first models with these dials fell within the 537xx- 542xx serial range. Most importantly these early survivors are printed simply with "Swiss" (with no T) and house a Valjoux 72 movement, the inner casebacks are signed Ed. Heuer. The matt eggshell white dial is extremely rare and to find one in this configuration and in such immaculate condition is not dissimilar to spotting a unicorn!