Rare and fine Rolex Cosmograph Daytona chronograph stainless steel gentleman's bracelet watch, ref. 6239, circa 1966, serial no. 147xxxx, with 300 unit bezel, silvered dial with applied baton markers, chronograph centre seconds with black subsidiary dials for hour, thirty minute recording and constant seconds, cal. 722 17 jewel movement, with screw down crown and twin pushers, expanding 7205 riveted Oyster bracelet with folding clasp and 57 end links, dated '4.67', 37mm *ex Dr. Hansell Collection; with period Rolex presentation box and Rolex service repair invoice dated 18.12.1978 Introduced in 1961 the Rolex Cosmograph, originally designed for use by driving enthusiasts, was the first Rolex to be fitted with a tachometer bezel that could calculate, among other things, average speeds and lap times. By the mid 1960s the model had gained the name Daytona after the famous American race-car track, with the first examples printed with Daytona in small straight text under Cosmograph and fitted with a bezel calculated to 300 units The bezel with 300 units were only available on the 6239 with Daytona printed in black underneath the Cosmograph, these were the first version of dial to feature the name Daytona Condition Report: Movement - appears working with chronograph setting correctly. Dial - good. Glass - light surface marks. Hands - good, typical light marks. Case - typical light marks and light scratching, inside case back with various service inscriptions. Crown - working correctly. Bracelet - good with typical light marks. Condition reports are provided for guidance only. Please view images and further information can be obtained upon request. Gardiner Houlgate do not guarantee the working order or time accuracy of any lots.Hammer , £20000, Rare and fine Rolex Cosmograph Daytona chronograph stainless steel gentleman's bracelet watch, ref. 6239, circa 1966, serial no. 147xxxx, with 300 unit bezel, silvered dial with applied baton markers, chronograph centre seconds with black subsidiary dials for hour, thirty minute recording and constant seconds, cal. 722 17 jewel movement, with screw down crown and twin pushers, expanding 7205 riveted Oyster bracelet with folding clasp and 57 end links, dated '4.67', 37mm *ex Dr. Hansell Collection; with period Rolex presentation box and Rolex service repair invoice dated 18.12.1978 Introduced in 1961 the Rolex Cosmograph, originally designed for use by driving enthusiasts, was the first Rolex to be fitted with a tachometer bezel that could calculate, among other things, average speeds and lap times. By the mid 1960s the model had gained the name Daytona after the famous American race-car track, with the first examples printed with Daytona in small straight text under Cosmograph and fitted with a bezel calculated to 300 units The bezel with 300 units were only available on the 6239 with Daytona printed in black underneath the Cosmograph, these were the first version of dial to feature the name Daytona Condition Report: Movement - appears working with chronograph setting correctly. Dial - good. Glass - light surface marks. Hands - good, typical light marks. Case - typical light marks and light scratching, inside case back with various service inscriptions. Crown - working correctly. Bracelet - good with typical light marks. Condition reports are provided for guidance only. Please view images and further information can be obtained upon request. Gardiner Houlgate do not guarantee the working order or time accuracy of any lots.