ROLEX REF 6238 SO CALLED "SOLO ROLEX" STEEL Rolex, case No. 1226687, Ref. 6238. Made in 1965. Very fine and very rare, water-resistant, stainless steel wristwatch with round button chronograph and registers.
This Rolex Made the First Solo, Nonstop Sail Around the World - Bloomberg
Rolex 6238:The Pre-Daytona That Inspired The Myth | Italian Watch Spotter
Cool Rolex of the Day #1918: 6240 "Solo" Daytona (only "Rolex" at the top of the dial), steel, 37mm. Circa 1966 : r/rolex
Reference 6239 Daytona 'Solo' | A stainless steel chronograph wristwatch with bracelet, Circa 1964 | 勞力士 6239 型號 Daytona 'Solo' | 精鋼計時鍊帶腕錶,約1964年製 | Important Watches | 2022 | Sotheby's
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6240 SOLO (unusual) / *Visionary Tokyo / Ring of Colour
Hands-On: So, What's The Deal With The Rolex Daytona 6240 Solo? - Hodinkee