In this post:
harrywinston.watchprosite.com
I presented you the Excenter Perpetual Calendar.
The Perpetual Calendar is an important complication in the Harry Winston story because the first Perpetual Calendar watch of the brand, the Biretro, was unveiled at the beginning of its watch adventure and was the first of the industry to use retrograde hands. It was also the beginning of the partnership with Jean-Marc Wiederrecht.
This Biretro Perpetual Calendar has a totally different dial layout from the Excenter one. It has a symetric one while the Excenter dial seems to be more strict. In fact, both are very original and are far from the classic presentation of the Perpetual Calendar QP.
The Excenter Perpetual Calendar:

The Biretro Perpetual Calendar:
