Panerai PAM 372 Luminor Historic 3 day 1950

Piaget Altiplano Skeleton Ultra-Thin
Piaget is the undisputed master of ultra-thin. The brand holds several world records for thinnest movements, both simple and complicated. At SIHH, the list of records grew by two with the introduction of the Piaget Altiplano Skeleton Ultra-Thin. Learn more about the new records, and find wallpaper and pricing information inside.Designing and constructing ultra-thin movements is part art and part science. The science and engineering side requires deep understanding of materials and movement architecture. The movement designers and engineers must not sacrifice rigidity to achieve a thin profile.Yet even the best theories provide only a starting point. In the real world, nothing beats experience, and Piaget is among the most experienced manufacturers in the ultra-thin realm. In 2010 the brand celebrated the 50th anniversary of the groundbreaking caliber 12P. Piaget currently offers 18 thin calibers, ranging from simple manual-wind two-hand models to automatic tourbillons and perpetual cal

AR Coating
So I was wondering, and I would like to hear other's input on this. If the sole purpose of providing a sapphire crystal on a watch is to prevent, and in many cases, eliminate the crystal from being scratched, why is anti-reflective coating applied to its outer surface? I can't seem to understand this. Granted it may provide a higher degree of readability in certain circumstances, but over the long run (years or even decades), it may cause perceivable scratches and imperfections on the crystal that are NOT covered under warranty. An example of this is the Planet Ocean. I own a SMP 2254 and this piece only has AR coating on the underside of the crystal and the dial can be seen perfectly in many and almost all circumstances. So, it seems like coating both sides of a sapphire crystal has no benefits, but rather only shortcomings. Any thoughts?

Curiosity: Hamilton diamond
There are many model that has diamond in the dial, are this really genuine diamond or rhinestone?

5711 vs 3710
HiWanted to hear, what do you think it's better...

Rolex gifts
I buy my Rolex watches from an AD that I have known for decades, and who gives me great discounts. However, they never seem to have promotional gifts of any kind. Thus, I¡¯ve come to think that Rolex promotional items are bought by ADs optionally, so some dealers may have them and others don¡¯t.Does anyone know exactly what¡¯s the deal with promo gifts...?