A friend who has a Rollex told me a trick his watch shop told him: mechanical watches run differently according to position. My particular example runs fast on the outside of my (right) wrist, slow on the inside. At night it runs fast on it's back, slow on it's 8 o'clock edge. Knowing this, I'm able to keep it running perfectly in time with the clock on my phone, within about 3 seconds, and I haven't reset it in weeks. It took a couple of weeks to stabilize--at first it was running quite a bit slow, but I guess the works got polished up and lubed by running, and now it's quite good.Though this watch doesn't have a hack feature, you can stop it by putting a slight backwards pressure on the stem while setting that serves the same purpose. Mine hasn't run down, so I can't say how long it will run on its own. Overnight is definitely not a problem. Again, it takes a while for the mainspring to get fully wound; don't count on it running overnight for the first few days, but after that it should be fine.
Rating:
[5 of 5 Stars!]