By (my) definition, a grail watch is a watch that a watch nerd (like myself) would get if he/she has 'enough' money to spare. It does not have to be the most expensive or the most exclusive piece, just 'THE' watch to get if money is no issue. I wrote my previous post as a celebration to getting my grail watch. Fortunately and unfortunately, I do not believe in dreaming of something that is "impossible" to get, as I do want to get myself over to the greener pasture! But why the IWC Big Pilot Perpetual Calendar? It is an association to human (aviation and mechanical) evolution, a piece of watch making history in these evolution, and a personal childhood dream of becoming a fighter pilot. All these delivered with practical complications within an (stretched) arm's reach...
Kurt Klaus, who invented IWC's perpetual calendar in 1985 using only pencil and paper, created a 'storm' in the mechanical watch industry at the peak of the quartz crisis. It was, and still is, a very rare mechanical perpetual calendar that shows 'day/date/month/year/ decade/century and moonphase of the northern and southern hemisphere' with an accuracy of 1 day deviation in 577 years to come.
IWC Caliber 51614, of Ref: 5026
62 jewels 3 Hz movement
Schematic of 51614's Perpetual Calendar
and Hemisphere Moon-phase Module
and Hemisphere Moon-phase Module
Not only did his invention triumphed over ALL other perpetual calendar from brands like Patek Phillipe and the likes, which does not display the 4-digit year, his was the only one that allows adjustment by the user via the crown in complete synchrony. While others require users to 'poke' several recessed buttons at the side of the watch case if adjustments are needed because the calendar is not current due to a stopped movement. Kurt Klaus designed a system that operates like any other watch with date display; ALL calendar displays on his perpetual calendar are programmed for 100 years, and can be adjusted via the crown. Not only does this boast usability, it eliminates the risk of scratching the watch case during adjustments, and also made higher water resistance rating possible.
All these were achieved with just 90 additional components on top of the base movement! Whereas is it not unusual to add 200 more parts for others to do less. This probably explains why IWC's perpetual calendar is among the least expensive because of serial production capability, but it is definitely not the least revered. At one point, IWC was producing more perpetual calendar than the rest of the industry combined! Google perpetual calendar, it will start and end with Patek Phillipe (some may urgue Breguet), but not without Kurt Klaus' legendary invention mentioned within, always.
Kurt Klaus presenting his Perpetual Calendar mechanism
in an IWC's 'Guide to Haute Horlogerie' series video
in an IWC's 'Guide to Haute Horlogerie' series video
Many called Kurt Klaus 'Einstein' at IWC's Schaffhausen factory, yet he regards Albert Pellaton as his master teacher. Perhaps IWC's greatest technical director, Pellaton taught Klaus that innovation is inherent in IWC's tradition, but the respect for classical principles should not be forgotten. Klaus did exactly that in every of his endeavor at IWC.
Klaus had a (strong) influence in the design of IWC's contemporary movement, Caliber 5000. A 7-days self winding movement with Beryllium balance wheel and Breguet overcoil spring, built upon the renown winding mechanism invented by Albert Pellaton.
Video showing how the Pellaton winding mechanism works
The super-efficient Pellaton winding mechanism ensures that the ultra-long barrel spring is wound to 8.5 days of reserve even with a sedate lifestyle. 1.5 of the 8.5 days will never be used, as the torque will be too low to keep accurate time. Kurt Klaus invented a mechanism to stop the balance wheel at exactly 168 hours of operation, so as to guarantee operating accuracy. The 1.5 days in reserve when the watch is stopped also mean that a twitch on the winding crown will move the watch again! Users do not need to "crank" the crown to wind it sufficiently to wear. The Pellaton winding system will keep the watch wound as soon as it is put on the wrist.
The Big Pilot Perpetual Calendar has Kurt Klaus and Albert Pellaton's finest inventions housed within a watch case inspired by the B-Uhr that IWC (the only Switzerland based company) supplied to Luftwaffe during WWII.
Original IWC B-Uhr watch
supplied to German Luftwaffe in WWII
supplied to German Luftwaffe in WWII
At 55mm in diameter, the original B-Uhr was designed to fit over leather flight suites of pilots back then. Its anti-magnetic case construction shield itself from negative influence of magnetic fields in the cockpit. The center hacking hands and a huge 'union' crown enable easy synchronization over thick gloves. More details of this timeless design can be found in an article written by James Dowling here.
All these explain why it is my grail watch, and I'm fortunate to finally found and own 1, but one that is unadulterated (in my opinion) by marketing moves and connections with Top Gun, Miramar, Le Petite Prince, Antoine de Saint Exupery, etc. Just pure watch making mastery and history, just purely IWC.
IWC Big Pilot Perpetual Calendar Ref: 5026-20
Limited Edition 'One out of 70'
Limited Edition 'One out of 70'