Just 6.3mm high, with the movement thickness 2.89mm, the Audemars Piguet Replica Watches Royal Oak RD#2 is the slimmest perpetual calendar on the market by quite some margin.Most slim perpetual calendar watches hover around the 8mm mark, case and all. The Vacheron Overseas Ultra-Thin Perpetual Calendar is 8.1mm, while the Patek Philippe ref. 5940 is 8.48mm.
The automatic base of the cal. 5133 is derived from the cal. 2120, the longstanding thin movement found in the Audemars Piguet Replica Royal Oak “Jumbo”. Highly regarded as a sophisticated construction that has remained in production for over 50 years, the movement was originally the Jaeger-LeCoultre cal. 920 and also supplied to Patek Philippe and Vacheron Constantin. One of the most distinctive features taken from the cal. 2120 is the support ring for the rotor to minimise wobbling and stress on the short pivot.
Like the cal. 2120, the cal. 5133 also minimises the components needed on the AAA Audemars Piguet Replica dial-side of the movement, utilising a hanging barrel for instance. That means the dial also serves as a main plate of sorts, helping to secure the parts in place.
Despite the significant technical advances inside the watch, the outside looks and feels very much like a classic Royal Oak, meaning it’s angular, refined and sharply finished. It is a departure from the aggressively styling of AP’s other concept watches, the Best Audemars Piguet Replica Royal Oak Supersonnerie and Laptimer Michael Schumacher.
The case is 41mm in diameter, but hefty despite being slim, due to the platinum case and bracelet. And though it’s almost a quarter thinner than the ordinary Swiss Audemars Piguet Replica Watches Royal Oak perpetual calendar, the decrease in height is not dramatically obvious on the wrist, perhaps because the watch was already thin to start with.
The dial is typical Royal Oak, dark blue with a chequerboard tapisserie guilloche. A casual observer would be hard pressed to distinguish between the Audemars Piguet Replica Watches RD#2 and an ordinary perpetual, though the differences are obvious, most prominently with the raised position of the sub-dials at three and nine.