1980 Seamaster De Ville with day and Date

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Hello, I am new to the forum and looking for information regarding my father's Omega Automatic Seamaster De Ville which I inherited. This was a gift from his work for 25 years so the back cover is engraved. I have owned it since about 1990 and my wife had it "serviced" by a local watch maker for Christmas a few years back. I assume it is about a 1980 model, however I cannot confirm that. I am looking for information regarding setting the day. The date and time will set however I cannot find out how to set the day. I'm also very interested in any manuals or such that may have been delivered with the watch new. It appears to keep time and if I set the date it does seem to track although I cannot verify the day following. This is an heirloom and I want to keep it in working condition. I do wear it from time to time however it is not out of the ordinary for it to set for up to a year in a case. Thank you in advance for any help you may have.

 
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If you turn the hands ahead past midnight, does the day advance?

To confirm the year of manufacture, you would need to know the serial number on the movement. However, for an engraved watch like this, it's overwhelmingly likely to be from within a year or two of the year engraved.
 
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No, the date advances but the day does not. Is there a possibility that the person that serviced the watch could have possibly damaged it?
 
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Is there a another position of the crown if you pull it out further?
 
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There are 3 positions for the crown. 1st is closed, 2nd is date and 3rd is time.
 
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Different movements have different solutions for advancing day and date. There are “quickset” functions such as 2 nd position which advances the date. If day does not change at all despite moving time full 24 hours past midnight then the day set function is not working properly and requires a service to fix usually it’s a simple fix. This is very common with vintage watch it’s not a big deal. Some have a “semi quickset” which requires turning time past midnight to around 2am, then turning it back to 10 pm or so, then forward again. You could try this see if it moves the day wheel forward . Probably needs a small part
 
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I think your watch likely has cal 1020 movement but you need to take to watchmaker to have it opened to be sure. This opens from front not back so don’t try to pry it open take it to watchmaker to open and see. If this is correct setting the day is a little different once you advance past midnight then you turn it backwards to change day. See attached video.
Just to be sure, have you advanced the hands past 12 twice to make sure it’s past midnight?

And put the hands at bottom- around 6:30 before trying to quickset- it’s better to protect the movement avoid trying to quickset between 9 pm and 2 am

https://www.google.com/gasearch?q=o...te=ive&vld=cid:d8052be1,vid:VuHEw_zMj1w,st:50