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Old 22 November 2020, 03:28 AM   #1
Watchtopian
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New to me 1675 circa 1968

Hello one and all,

I recently acquired a 1968 (2.4m serial) GMT 1675 from a dealer that I have dealt with in the past and heís always been reliable but had a question about the watch.
So from reading the various posts and other site it would seem the 1560 Cal was replaced with a 1570 cal around 1965 but the movement in mine has 1560 engraved on the bridge. Is it normal to see this? My movement isnít a hacking one either which is inline with that they say online.
Any insight would be appreciated.

Thanks


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Old 22 November 2020, 07:12 AM   #2
Pocosso
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Interesting, it should be a 1560 with that serial...
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5167-5711
6217-8001
16520A-16520E-16500-116610LV-166710LN-16760-16030-16570T-
ROO(Ti)-RO-ROC
PAN0055-PAM351-PAM733-PAM721
Type XX-XXI
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Old 22 November 2020, 07:14 AM   #3
Watchtopian
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Oh! So it should be a 1560 in a 1968 GMT 1675?


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Old 22 November 2020, 07:18 AM   #4
Dan S
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Those bridges got swapped all the time. Is it actually a 1570 or 1560? Measure the beat rate.
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Old 22 November 2020, 08:17 AM   #5
bmb15
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Yes
1560: 18000 bph
1570: 19800 bph
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Old 22 November 2020, 09:04 AM   #6
Watchtopian
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Thanks everyone for the info.

I just measured the beat rate and it is 18000.

Would this mean the movement was swapped out?


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Old 22 November 2020, 12:22 PM   #7
springer
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I have seen 1560 movements in 1968 1675 models before. They were suppose to have been discontinued a couple years before that, but as Rolex goes, it is what it is. I wouldn't let it bother me.
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Old 22 November 2020, 12:41 PM   #8
Watchtopian
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Good to know. The watch is great for the most part just a few things out of place like an older gilt dial era insert and a really crappy re lume job at some point.

Thanks for all the info


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