GMT-Master, reference 6542 Montre bracelet en acier avec deux fuseaux horaires, date et lunette Bakélite | Stainless steel dual time zone wristwatch with date, bracelet and Bakelite bezel Vers 1957 | Circa
GMT-Master 'Captain Warren', Reference 6542 | An advert worn stainless steel dual time zone wristwatch with date and bakelite bezel | Circa 1958 | 勞力士 | GMT-Master 'Captain Warren' 型號6542 | 精鋼兩地時間腕錶備日期顯示及人造樹膠錶圈,製作年份約1958
Rolex GMT-Master 6542 US Air Force – Vintage Chronos Germany