Been reading on perpetual calendar chronographs

https://timetransformed.com/2017/10/12/top-ten-perpetual-calendar-chronograph-watches/

Nice insight on the interplay of having both complications.

 

I believe @ChicagoFrog has a platinum 3940 first execution, you can see it on his Instagram. It is really a fantastic watch.

Christie's is selling a first series with a German calendar in their upcoming Geneva auction. I'll be curious to see what that one goes for:

https://www.christies.com/lotfinder...ils.aspx?from=salesummery&intObjectID=6269168

The one A Collected Man listed (that I referenced earlier) is now sold (it was listed for $48,000, for future reference).

 

I believe it’s a later series 3940G but yes, a fantastic example nonetheless

 

Locally 5327 from AD brand mew is almost the same as a 3970 from 1994 through a European dealer. Hmmm. Lots to ponder.

3940 would be about 40% cheaper.

 

Enjoying this now

 

Most (except for those that have accounted for the formula any year that is divisible by 4 and 400 is a Leap Year.) perpetual calendars have to be manually adjusted in year 2100. To skip Feb 29 and go straight to Mar 1.

however, for PCs that show the full year (like JLC and IWC) and not a leap year indicator, have the movement/dial also account for this? Or will a plate be changed in 2100 (maybe january).

i guess i wont be there to find out.

 

No, almost all perpetual calendars will have to be readjusted in 2100 because there will be no Feb. 29th. Those that have individual manual pushers can be adjusted easily, those that use the IWC (Kurt Klaus) module that adjusts all functions via the crown or with ONE pusher will have to be opened up and adjusted by a watchmaker. There have been a few secular perpetual calendars made in which the lack of Feb 29th in 2100, 2200 and 2300 are automatically taken into account. Svend Andersen makes one, and I believe Patek Philippe made a few examples back in the 60's or 70's.

 

^ that’s what i was thinking.

but those that show the year like this one. Clearly there are plates for the tens and ones position of the year. So this is good up to 2099 for sure. But is there also a plate to replace 20 with 21 already installed in the watch?

 

A clearer picture plus a close up of the year aperture

 

The IWC DaVinci of the mid-80s was the first watch to use this design and the century slide had '19', '20' and '21' on it which would get you to 2199. The slide moves upward at the change of each century. Included in the kit was a second slide in a glass vial with '22', '23', and '24' on it that would get you to 2499, after that your future descendants would have to deal with it. But it still would require intervention in 2100, 2200, 2300 to fix the lack of a Feb 29th, but you'd be ok in 2400 since it has a Feb 29rh. Worry about it in 80 years.

 

that’s what i was looking for. ty sir. would you know if the jlc caliber is built similarly?

 

If it has a single pusher to advance all functions than yes, it's built the same.

Just checked the owner's manual for your watch, built like I described, it will need intervention in 2100 to adjust for lack of leap day.

Until then, relax and enjoy your watch.

 

Very cool Speedmaster, haven’t seen it before.

Was going to ask the ref. number, but it could be another watch than the one in this article:
https://www.fratellowatches.com/speedy-tuesday-omega-speedmaster-perpetual-calendar/

Pretty cool combination of sport and classic, nice watch sir.

 

Soms while ago, I came across this Ulysse Nardin on a friends wrist.

Diver watch with sapphire caseback and perpetual calendar? I think only Ulysse Nardin could pull this off. Despite the contradictions, I liked the watch.


P.S.: Sorry for the bad pictures, it was late and lighting was poor.

 

^ nice

UN also has a perpetual calendar chronograph GMT watch

 

Thanks.

yes it has a single corrector.

and checked the manual. The year plate as two positions. 20 and 21. But it has to be adjusted by the watchmaker since fixed. Recommendation is for it to be adjusted at same time as the date and moonphase on 1 mar 2100. So for two months, it will read 2000 even when it’s 2100 already.

in any case, not my problem anymore.

 

Watching these two race.

 

Perpetual Calendar Chronograph

 

Wow. Now that is a great watch, 3970 3rd series if I am not mistaken?

Congrats, absolute stunner

 

thanks. Not sure of the series. How do you find that out? Serial is 3xxxxxx.