Insider: Audemars Piguet Royal Oak Openworked Perpetual Calendar. A Masterpiece of 'Haute Horlogerie'.

A couple of weeks ago, we met with our watchlifestyler friend Olivier —we have featured another one of his timepieces in a story here – just to once again be left in awe by one of the amazing timepieces in his collection. This time, the watch on his wrist was an Audemars Piguet Royal Oak Quantieme Perpetuel ref. 25829PT.OO.0944PT.01 in platinum. Just an amazing reference that doesn't need much explanation or a long write-up.

This Royal Oak Perpetual Calendar features day, date, moon phases, months and leap years with a fascinating openworked dial that is pure perfection. The blue anodized hands and the moon phase disc provide the right amount of contrast to this masterpiece that looks as good under the sleeve of a tuxedo or while wearing a pair of jeans and a plain Lanvin t-shirt.

The watch is extremely heavy as expected on a precious metal piece of this nature —our guess is that this watch weighs at least 200 grams. We promise we'll bring our scale next time we meet with Olivier and update this article with the exact weight information.

The watch is fitted with the Audemars Piguet extra-thin automatic calibre 2120/2802 composed of 343 parts and 38 jewels. This automatic movement provides a power-reserve of 40 hours when fully wound. Additionally, just as with the Royal Oak Extra Thin 'Jumbo' the oscillating weight can be customized upon customer's request. 

If you appreciate 'haute horlogerie' as much as we do and you have some extra watch funds laying around there, this complication would be a great addition to round up your collection. 

Sticker Price $144,900 USD. For more info click here.