The date begins changing a little after 12am but finishes changing at 3am; if I go backwards, it begins changing back at 12am but finishes changing at 9pm. I was told some change quickly at 12am and some don't - watch is keeping perfect time. Is this all normal?
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QuoraThere is a gear within an analog watch that is used to change the date at the appropriate time. The gear ... Watches: What is a fair price for a authentic 1970's vintage "McQueen" Rolex Explorer II? Why does the day start at midnight?
I assume you are talking about a day-date Timex. Timex watches do have a quickset feature meaning the day and date can be set without having to simply advance the time by 24 hours to adjust the Day-Date. Not all watches have a quickset, but I'm sure your Timex does. Unscrew the crown from the stem by turning it counter clockwise until it is free from the threads. At this point pull the crown all the way out so that you can adjust the time. That's position 2 the quickset is in position 1 but the tricky part is getting the crown in the proper position to engage the quickset. Push the crown in very slowly while turning once you see the day or date window advance stop turning you are in position 1. Day and date can be set in this position by turning the crown in either direction. If your watch does not have a quickset or you cannot figure out how to engage it you must set the date by advancing the time forward 24 hours. This will make the date window advance by one day. Once the right date is displayed turn the time backwards 24 hours and this will cause the day window to move without affecting the date window. And that's all there is to it.
on 1570 movements there is no quickset feature therefore you must turn the hour hand 24 hours to change the date but 3035 and other later movements equipped with quickset wheel and if you pull out the winding crown you can change the date.
The date on mechanical and automatic watches change normally between 2-4am because this is normally when people sleep. It is not broken or in need of overhaul. It has to change sometime and that is what they have tradionally used as a time for the date to change. Also remember it is normal for an automatic or mechanical watch to loose or gain time friction is the culprit here since the gears do mesh with each other.
Fine watches like Rolex and Omega are beautiful watches but expensive to have cleaned. It should be cleaned about every 10 years or if it starts to loose a lot of time.
Incidently most agree that the Omega speedmaster manual wind (The watch that went to the Moon) is the most accurate of the bunch and is very sought after by collectors!
What you have is an older model Datejust -- or at least an older model movement. During the 1950s, many Rolex Datejust models had an alternating red/black date wheel. Tudor (Rolex's second brand) also had movements with the same red/black date wheel. BTW, those watches are becoming more and more collectible. Sounds like you may have a nice classic on your wrist! :-)