To celebrate the the twentieth anniversary of their Excenter collection Harry Winston have released a limited edition model called the Premier Excenter Perpetual Calendar. The Harry Winston Excenter was amongst the first watches to feature retrograde indicators. The Harry Winston Premier Excenter Perpetual Calendar features an open dial allowing one to see the interior workings of the movement and has a platinum case. Only twenty pieces of the Harry Winston Premier Excenter Perpetual Calendar will be made and will be available exclusively from Harry Winston stores.