At least the broadband connection at home works, so I can write a little blog entry about this watch. Tintin from Thailand sent it in, and it’s probably the best UltraChron I’ve seen in this workshop. It’s in almost mint condition…
I love the 431 movement. Fast beating at 36,000 b.p.h, and built with the usual Longines quality. Great design, and I would wear this watch very happily indeed.
The condition of the case back is remarkable. The watch looks totally new old stock.
The dial is impeccable. Not the slightest mark, and as good as new.Still a remarkable performance considering the movement is totally dry, and that it’s so fast beating! But the amplitude is low, so a service is well in order.
The 431 is not only technically well made, it also looks very nice indeed.
The rotor is screwed to the automatic device bridge with a screw and two washers, which I find a bit unnecessary. In the end, you just want the inner ring of the rotor bearing to be tightly screwed to the bridge, and all other manufacturers achieve that with a single screw. Only Longines needs a screw and two washers 😉
The base movement. The shock system is a KIF, with its tell-tale shock spring design.
The gear train.
The 431 has a super date change, which is as snappy as a Zenith on a good day. A slow power build-up guarantees that there is minimal impact on beat rate and amplitude during the date change.
Simple, but very effective.
Did you say “Do not open?”
Oopsy. As the power reserve is a bit low, I am fitting a new mainspring. The original isn’t available any more (no complete barrel, no mainspring), but I find a very close 0.95 x .15 x 340 x 11.2.
Everything goes into the cleaning machine.
The new mainspring for the barrel.
The gear train goes in.
Look at the condition of all the screw heads and the plate. Not a single scratch, no marks, nothing!
Just put together, this is looking very good, and we have a decent amplitude.
What a beauty.
The automatic device is back together. Marvel at the condition.
Utterly pristine.Not a mark on the case either, and I really really would love to own this watch. Lucky Tintin!