While reference 16520’s popularity has increased dramatically in the past few years, few automatic Cosmograph Daytonas are as beloved as the ‘R Series’. Still displaying the original factory sticker on the case back, this reference 16520 features a so-called ‘porcelain’ dial displaying the “Cosmograph” script floating below the text at 12 o’clock. Made of lacquer, “porcelain” dials were only fitted to the earliest 16520s. The black graphics were printed on top of the dial, giving it a three-dimensional effect. Of particular note is the “inverted 6” on the lowest subsidiary register, a detail that is particularly beloved by collectors today.

Virtually unworn, the case is offered in unpolished condition, displaying razor sharp lugs and full proportions. Furthermore, this rare Daytona retains its original early steel bezel calibrated to 200 units. Later generation examples would have a bezel calibrated to 400 units.

Impressively, this watch is accompanied by its original warranty, stating that the watch was sold at Herteen & Stocker in the USA. Still in business today, the retailer is situated in Iowa City.