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Old 19 May 2019, 01:18 AM   #1
Butchh
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Accuracy

I’m wondering what you all consider acceptable accuracy for a fifty year old Datejust 1601? It’s losing about ten seconds per 24hr period. Thank you...
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Old 19 May 2019, 04:12 AM   #2
watchmaker
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Depends when it was last serviced. If it was serviced last year -10s/d isn’t great. If it’s not been serviced in 15 years -10s/d is fantastic.
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Old 19 May 2019, 04:23 AM   #3
Butchh
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Quote:
Originally Posted by watchmaker View Post
Depends when it was last serviced. If it was serviced last year -10s/d isn’t great. If it’s not been serviced in 15 years -10s/d is fantastic.
Great point! Thank you for your input!
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Old 19 May 2019, 05:53 AM   #4
iliketime
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just sent off a datejust from 1980 that appears to have never been serviced. worn often but never serviced. on wrist it kept good time, but set it down and it was a minute slow the next day. id say -10 isnt bad but it may be time to get it serviced.
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Old 20 May 2019, 01:04 AM   #5
Toronto Soup King
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My watchmaker says to bring watches in when they start losing time, but 10s/d isn't an emergency.
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Old 20 May 2019, 03:59 AM   #6
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10 seconds wouldn't bother me.
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Old 20 May 2019, 04:05 AM   #7
Tools
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10s day is pretty standard for a watch 50 years old. They were not expected to be as accurate as modern high-beat movements are.
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Old 20 May 2019, 09:02 AM   #8
Old Expat Beast
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That's just about what most of my 1960s Rolex run, give or take, when serviced. My vintage 1960s Grand Seikos usually come back from service around +1 or +2 secs per day, but they are all 28,800 or 36,000 BPH.
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Old 20 May 2019, 11:52 AM   #9
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For a 50 year old timepiece you bet.
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Old 23 March 2020, 02:59 PM   #10
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I’ve just received my 1675 back from RSC, and it’s running just under +3spd. They have it a good clean and swapped out the 8039 hour wheel I’ve been trying to find, and changed the seconds hand, tube, and crown — but nothing more.

My watchmaker replaced a few other wheels and the palate for me, but the rest of it is pretty unchanged since 1971 (when I bought it, there was only one watchmakers scrawl on the case back and the movement was very rough, though it had had a service dial and handset fitted (not at the same time)).

I’m chuffed with 3spd for a 50 year old piece worn daily!




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Old 23 March 2020, 11:37 PM   #11
AJMarcus
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I recently purchased a 1968 DJ 1603 that hadn’t been serviced in 15 years. Had a complete service by my Rolex watchmaker and it keeps time well within COSC standards.
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Old 24 March 2020, 06:18 AM   #12
dgl90
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My 1601 I used to have ran at -8 seconds a day consistently. I’d say for a 50 year old watch it wouldn’t bother me.
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