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Brand: Rado
Model:Diamaster 10 (a.k.a. Diastar 10)
Case:Tungsten-carbide bezel with stainless steel screw-back
Crystal:Synthetic sapphire
Bracelet:Stainless steel "fish-tail," reference unknown
Movement:A. Schild automatic Cal. 1876, 25 Jewels, gilt, day-date with quick-set date by depressing crown
1969 advert for Rado Diamaster 10

Description:This is a massive scratch-proof Diamaster 10 from the early 1970s. This model has many noteworthy features among Rado watches. The most obvious is the enormous square tungsten-carbide bezel with rounded edges. The Diamaster 10 is a member of the Rado Diastar line, which was introduced in 1962. Featuring scratch-proof bezels and stainless screw-on backs, as does the present watch, the early Diastars were exclusively round or oval watches. The Diamaster's shape represents one of the first diversions from that theme. According to data supplied by Rado, 2000 units of this watch were produced between 1969 and 1972; the retail price at that time was 750 CHF. Water-resistance was claimed by Rado to be 22 ATM (~715 feet). Japanese advert for Rado Diamaster 10

Another unusual feature of this model is the use of separate windows for the day and date; the colors are different as well, perhaps to draw attention to this unusual design feature. The wide bezel overhangs the dial and markers somewhat, making the dial seem very tiny, but it is still easily read.

1971 advert for Rado Diamaster 10The third unusual element of this watch is the movement. The majority of Rado watches produced during the 1960s were powered by A. Schild movements; quite a variety of calibers were used. My observation of many dozens of vintage Rados suggests that the caliber 1876 found in this watch was not frequently employed. Interesting features of this movement include the unsigned winding rotor (the only type of automatic Rado movement I've ever encountered without the Rado name or logo present on the rotor) and the ability to quickly set the date of the calendar by pushing the crown.

Advertising slick courtesy Rado Watch Co.

The case of this Diamaster shows very little wear; the dial is original and exhibits no defects with the exception of patina (due to age). The movement's prior service history is unknown but it is working perfectly and, along with the rest of the watch, remains in nearly unworn condition. Unusually thick crown is signed with the anchor logo. Period-correct "Years Ahead" Rado box is present with this watch

Photos: Click for larger images

Rado Diamaster 10 with 'fish-tail' braceletRado Diamaster 10 in boxDetail of Diamaster 10 dialDetail of Diamaster 10 hands & markersDetail of Diamaster 10 bezel and crown

Rado Diamaster 10Rado Diamaster 10 in boxRado Diamaster 10 case backA. Schild cal. 1876Detail of A. Schild cal. 1876

This watch is not available for sale.

Note: More specific information pertaining to the manufacture/issue date of this watch is welcome. Please e-mail me.

Text and images 2009 C. Bradley Jacobs,
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