Amadeus
·Without a doubt from the 1930's to the mid 60's.
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What is sure is that modern movements have most often greater frequencies. There is statistical reasons why it should increase the accuracy. But then you have to reduce the size of the balance and increase the power of the mainspring.
I prefer the other choice - the one that is no longer chosen generally speaking! That is to say a large balance with a great moment of inertia and "puissance réglante" (do not know how too translater that) - which could also imply large barrel like in the Zenith 135. It is an old debate - at least it dates back from the 18th c when, for instance Romilly argued for a moderate frequency of 14. 000 bph.
I like big balances (should maybe try a song with that...) not only because they are - at least to me - much more beautifull, but also because I find their technical choice more interesting. And because this technical choice can be seen, is even a key to look at and understand the movement, such movements are at the same time beautifull and acurate.
Actually, they are beautifull because they are efficient - which is an old philosophical idea that, maybe, only some watches can fully embody! The same could probably be said of every nicely made watch. But the construction of calibers such as the Z 135 or the Omega 30 has a rare equilibrium, where the elegance tries and succeed to embody the functionality. No more, no less. The idea what is beautifull is efficient and vice versa is a topos of technology - and often it is a legend - but sometimes it appears to be true!
So yes, the 1930 (hey, do not forget calibers such as the 26,5!)-1960 period is one of the very best one!
Respectfully, Tony C., and most other members of this forum, know more about watch making and watches than I will ever know. I still regard the present era, -
and every subsequent measurable era, the finest. The master artists, crafts persons and technicians from the early and mid twentieth century would be dumbfounded by what is currently available. The breadth and depth of what is available is without precedent. Patek for some, G-Shock for others, Citizen Eco -Drive for many. Please don't misunderstand me. I long for an air-cooled, rear-engined sports coup with a manual transmission in my garage. I feel privileged to live in a time when I have the option of having the watch equivalents of a '72 911 alongside a Tesla Model S (I have neither btw)
The consensus seems, if we stretch it, to be between the 1920's and the 1960's. There are a wide variety of participants here who often disagree on almost everything, and the range of agreement for this is fairly narrow, and almost no one other than you believes the present is the Golden Era. Now, I want to be clear: I am in no way saying you are wrong, but given the collective wisdom represented, I would have to point out that your opinion is an outlier, and either you are on target, and everyone else is missing something, or...
The consensus seems, if we stretch it, to be between the 1920's and the 1960's. There are a wide variety of participants here who often disagree on almost everything, and the range of agreement for this is fairly narrow, and almost no one other than you believes the present is the Golden Era. Now, I want to be clear: I am in no way saying you are wrong, but given the collective wisdom represented, I would have to point out that your opinion is an outlier, and either you are on target, and everyone else is missing something, or...
Note that there is selection bias at work - you asked this specifically in the vintage section, on a forum that heavily leans towards vintage watches. The vintage section here has over 200k posts, - not other section comes close to that. I do believe the numbers would be different if asked in another section where more modern watch fans participate, and even on a large forum that is not nearly as vintage focused as this forum is.
The thing in my opinion is that the watchmakers used to be artists now they are engineers, is like comparing Leonardo Da Vinci with a modern copy machine…. Of course the modern results are better but the process is totally different… don’t get me wrong, there is nothing bad with modern watches is just a matter of what is important for you.
That's a fair point, but then again, should a more balanced sample produce a higher percentage of respondents choosing more recent times as the Golden Era, they'd still be wrong. 🙄

Note that there is selection bias at work - you asked this specifically in the vintage section, on a forum that heavily leans towards vintage watches. The vintage section here has over 200k posts, - not other section comes close to that. I do believe the numbers would be different if asked in another section where more modern watch fans participate, and even on a large forum that is not nearly as vintage focused as this forum is.
😜