Tudor Oysterdate Chronograph Big Block 79170The Full Set White Porcelain Big Block The Tudor Big Block is a key piece of Tudor history as it was the first automatically wound chronograph from Tudor or Rolex, in fact it was released a full decade ahead of the reference 16520 Rolex Daytona. This Big Block has a white, almost porcelain dial; a little like the early so called floating Daytona. The dial remains in perfect condition and all the lume plots are all intact. The case remains in good