Here we have a lovely example of a circa 1931 ladies Art Deco 9ct gold cased, jump hour watch. It has an AS 748 manual wind movement with 15 jewels, which displays the hours and minutes. These are presented on discs which show through the apertures cut into the front of the case. The white painted discs are original and untouched, with the black Arabic numerals and tracks. The apertures are framed with the rectangular front, with the bevelled sides. The lugs are fixed gold bars. The sides of the case have the same polished finish. to the right is the neat coin edge crown. The case back is free of personal engravings and has the clear serial number. The case is petite in its proportions, measuring 12.25mm wide x 26.75mm long, with the total lug-to-lug length of 30mm.
 
The case is 9ct gold and has hallmarking from Glasgow assay office, with the date letter dating it to 1931. It has the UK makers mark ‘SD’ which is the mark of Sylvain Dreyfus, who was the UK importer of Rotary watches. 
Rotary watches Ltd were established in La Chaux-de-Fonds, Switzerland by Moise Dreyfuss in 1895. In the 1920s family members Georges and Sylvain Dreyfuss began exporting Rotary watches into Britain, via the M Dreyfus watch manufacturers name, in Moorfield, London EC2. 
 
Inside is the AS 748, 15 jewel Jump hour movement, displaying the hours and minutes. It is marked as “Cut & Compensated Balance A.I.”.  
The movement has been recently serviced and is keeping time to within 60 seconds variation a day.
 
A beautiful Art Deco jump hour, in a precious metal case as opposed to the less costly nickel chrome designs. Every collection needs a vintage jump hour!
 
The watch is modelled on a 7” wrist circumference
Full condition report below. Please see the images as these compliment and aid the description provided below.
 
Dial:
The two discs have the original paint which is in aged condition with some losses, particularly from 40-60 minutes. 
 
Glass:
The acrylic lens is original and is in good condition with only light marks.
 
Crown:
The crown is original and is in good condition with light marking.
 
Case:
The case is formed of gold and is in good vintage condition. It has the polished finish with only light marking. There is a mark above the hour aperture on the front.
 
Caseback:
The case back is hinged to the top and is in good condition with only light marking associated with age.
 
Strap:
The watch comes on a new genuine leather strap for fixed bar lugs.
 
Movement:
The movement is an AS 748 15 jewel manual wind calibre. It has a frequency of 18,000 BPH.
It is marked as “Cut & Compensated Balance A.I.”.  
 
The movement has been recently serviced. It’s keeping time to 60 seconds variation a day, with an amplitude of 200 degrees and a beat error of 3.9m/s.
 
Case dimensions:
Case width: 12.2mm
Case width with crown: 13.5mm
Case length: 26.75mm
Case length lug to lug: 30mm
Case Depth: 5.8mm
Lug width: 8.5mm