Something that you don't see often - Rolex Datejust "Ovettone" Ref.6305-1 featuring 18K yellow gold so-called "Big Bubbleback" case. It was one of the few last references to use Bubbleback movements before cal.1570 was introduced. 

The watch went through complete service in May 2016.

Manufacturer: Rolex, Switzerland 
Model: Oyster Perpetual Datejust
Reference: 6305
Type: Automatic water-proof chronometer with date
Year of production: ca.1954
Case type: 3-body, mixed satin and mirror finishing. Fluted bezel.
Case material: 18k solid yellow gold
Case measurement: 36 mm (without crown) / 50 mm (lug-to-lug) / 20 mm (between lugs) 
Case serial number: 971775
Case back: Screw-back signed 'Montres Rolex SA Geneva Switzerland'along with Swiss gold hallmarks and reference number "6305 1". 
Crown/pushers: Original signed screw-down crown in yellow gold 
Crystal: Original plastic with cyclop lens
Movement type: Automatic chronometer with sweep seconds hand and date, non-quick-set
Movement model: Cal.745/A296 signed 'Montres Rolex SA, Geneva Swiss, 18 Jewels 7 Jewels Rotor'.18000 A/h, 45 hours of power reserve. Serial number: 84829 / Rotor: 98719 
Dial: Flat silver sunburst dial decorated with black printed minutes track on the outer perimeter of the dial, raised yellow faceted hour markers with luminous plots. Raised golden Rolex crown at 12 o'clock. Signed 'Rolex' and 'Oyster Perpetual Datejust' at 12 o'clock and 'Superlative Chronometer Officially Certified' and 'T Swiss T' at 6 o'clock. 
Hands: Golden luminous hour and minute hands (tritium), golden sweep seconds hand. 
Case condition: 1 (mint). Professionally polished, showing no traces of use.
Movement condition: 1 (mint). Professionally serviced in May 2016. Adjusted and keeps good time. 
Dial/hands condition: Authentic service dial by Rolex, replaced most likely in the early 1960-s along with hands. The dial is in perfect condition except little flaw - the lume plot at 10 o'clock. Hands are in mint condition and show matching aging of lume. 
Overall condition: 1 (mint).
Delivery set: The watch comes with RIOS1931 genuine leather strap and generic gold-plated buckle, our company’s warranty certificate, general terms and conditions of sale.

Warranty: 1-year technical warranty in accordance with terms & conditions (limitations may apply)