Tudor Oysterdate Chronograph 79170 Big Block with PapersThe 12 Hour Bezel Panda Big Block The Tudor Big Block was an exciting piece for Tudor as it was the first automatically wound chronograph from the WiIlsdorf stable a full decade ahead of the reference 16520 Rolex Daytona. This example houses a classic Panda dial, which is sliver with black sub registers and is the rarest version with the bi directional bezel. The dial remains in perfect condition and all the lume plots are all intact that have turned