Seiko Marinemaster Tuna Spring Drive Watch
A Seiko Marinemaster 'Tuna' Spring Drive Watch. Ref SBDB013. circa 2016. Bright Titanium Case Material with DLC (Diamond-like-Carbon) Hard Coating 1.93 in. Bright Titanium Unidirectional Rotating bezel Sapphire glass with anti-reflective treatment, automatic calibre 5R65 30 Jeweled Spring Drive movement (±1 Second Day-to-Day) Accuracy, black dial with Strong Lumibrite markers and hands, date window at four o'clock and power reserve indication. Silicone divers strap with tang style pin buckle. Box and paperwork.
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- Circa - A Latin term meaning 'about', often used in the antique trade to give an approximate date for the piece, usually considered to be five years on either side of the circa year. Thus, circa 1900 means the piece was made about 1900, probably between 1895 and 1905. The expression is sometimes abbreviated to c.1900.
- Bezel - On a clock or watch, the bezel is the metal frame into which the watch or clock glass is fitted. In clocks, the bezel may include a hinge and a flange, in effect a door to the face of the clock. In jewellery the bezel is a band of metal with a projecting lip that holds the gemstone in its setting.
- Movement - The technical name for the workings of a clock or watch, and does not include the dial or case.
- Date Aperture - A date aperture is a cut out section in the face of a watch or clock, displaying the day of the month.
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