What time is it? Watches and horology

There’s a reason why it’s been the standard for decades. Reliable, slim, easily serviced, and can be made to run at chronometer spec without difficulty. I have a few watches with them in (and one or two more with the Sellita SW200 clone).

The only real weakness is that they don’t like being hand wound too often. The power reserve isn’t the best nowadays either, but then ETA make a slightly modified version that runs at 3hz (rather than 4hz) which results in an 80 hour reserve, under the Powermatic moniker in Tissots and others. Nivarox hairspring too.