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Named after the town on the island of Kyushu where it is produced, Arita porcelain is prized for its delicacy and colour, but not well suited for dials in its fragile, natural state. So the dials of the new Presage watches are made from a new type of Arita porcelain that boasts four times the hardness of ordinary porcelain.
The dials are produced by Hiroyuki Hashiguchi, the chief of Arita porcelain maker Shingama. First, the porcelain is shaped in mould and then fired in an oven at 1300 degrees Celsius, before being glazed by hand with a spray gun and fired once again to set the glaze."