Oysterdate Big Block

The Oysterdate 'Big Block' ref. 79170 is Tudor's 1980s–1990s automatic chronograph, named for the thick case that houses the self-winding movement, in a 40 mm steel Oyster case with screw-down pushers and a tachymeter bezel. It is powered by an automatic Valjoux 7750-based chronograph with a date.

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