/fa/ - Fashion

>>15322747
yes.

>>14029242
It was $3700

>>14022037
Yes

>>13971220
>back when mechanical watches were all that existed.
This isn't really totally true; tuning fork watches came to market in 1960. But tuning fork watches through the end of the competitions in 1968 never approached the level of precision that observatory chronometers required, largely due to their inherent positional variance.

>>13930108

>>13880252
I'm not an expert in machining so I can't give you a great answer. But it seems reasonable to me at least to say that it will be very hard to counter the difference between horizontal and vertical positions. The difference between vertical positions, yes. But the way the arbor interacts with the jewel is so different between horizontal and vertical positions that ensuring constant friction seems very difficult. That said, my understanding is that modern lubricants have meaningfully improved this particular issue in the last hundred years.

You can do this, and then use a differential (similar to what's used in Dufour's duality, for example) to average the rates. It is hard for me to intuitively imagine what would happen. If you had six balances, then certainly you could average all six and achieve very good elimination of positional variance due to hairspring geometry.

Fundamentally, based on the way we use mainsprings in watches, there needs to be some gearing between the mainspring and the escape wheel. If you envision a design that doesn't have these two elements, there are presumably other options. Electric watches, for example, don't provide power from the mainspring, but rather from an electromagnet powered by a battery, and so are free of this particular issue.

>>13880266
The competition movements from the observatory competitions of the 60s achieved astounding levels of precision - much, much higher than those ever found in production watches. Looking at observatory.watch, the best result at Neuchatel was an Omega movement, serial 10829676, which achieved a score of 1.73. Even if this movement had an exactly perfect average rate, exactly zero temperature variance, and exactly perfect rate resumption, it still had an average positional deviation of less than 0.4spd. This was achieved in 1967. Mechanical watch adjustment is, above all else, largely the result of tedious, hand-performed adjustment labor on individual movements.

>>13858824
The observatory gp

>>13826929

>>13675138
As far as I'm aware only three brands sold series-produced observatory chronometers to the public: Rolex, Girard Perregaux, and Seiko. Omega made an observatory certified quartz marine chronometer, which is also on my list. I think... Krieger? also made a more recent marine chronometer certified at besancon, though I don't really care for it, so I may not actually get that one.

>>13675155
I really appreciate the pursuit of accuracy as something watchmakers should strive for; a lot of my collection (chronometer or chronometer-level watches, observatory watches, tuning fork watches, HAQ quartz) relate to the progression of that drive for accuracy. It's what I respect the most about modern Rolex, their production of a million watches per year at a 2spd certification.

>>13617681
It's solid gold. I found it on eBay and paid a few kilobucks for it.

>>13601867
Admittedly has a date but probably still counts.

>>13539320
This is probably my favorite watch of mine.