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Davidloverolex · 7 March 2017, 07:52 AM

Hi members of the Rolex Forum,
I just finished collecting 30 days' worth of data (out of curiosity) regarding the accuracy of my IWC Mark XVII (ref. 3265-04). On Feb 4, I set my watch to the official atomic clock and every day thereafter, I recorded how many seconds it was faster than that time source. I wore the watch on my wrist for the majority of the day and it always sat crown down on the nightstand. I have attached an excel picture of the data. The mean rate was +0.903 seconds/day and the standard deviation was 0.405 seconds/day. What do you think of its accuracy? Has any one of you done analysis like this for your watches? If so, please let me know of your results as I am eager to compare. Any comments regarding charts formatting and/or statistics work?
TL;DR: My IWC gains on average 0.903 seconds/day.

statsman · 7 March 2017, 11:23 PM

That's fantastic work! Very interesting. Is there some significance to "crown down"? I have found my Rolex 1016 does best when I leave it that way at night.

sea-dweller · 5 July 2017, 11:42 AM

Beautiful watch.

7 March 2017, 07:52 AM	#1
Davidloverolex "TRF" Member Join Date: Sep 2016 Location: Texas Posts: 19	The Accuracy of My IWC Mark XVII Hi members of the Rolex Forum, I just finished collecting 30 days' worth of data (out of curiosity) regarding the accuracy of my IWC Mark XVII (ref. 3265-04). On Feb 4, I set my watch to the official atomic clock and every day thereafter, I recorded how many seconds it was faster than that time source. I wore the watch on my wrist for the majority of the day and it always sat crown down on the nightstand. I have attached an excel picture of the data. The mean rate was +0.903 seconds/day and the standard deviation was 0.405 seconds/day. What do you think of its accuracy? Has any one of you done analysis like this for your watches? If so, please let me know of your results as I am eager to compare. Any comments regarding charts formatting and/or statistics work? TL;DR: My IWC gains on average 0.903 seconds/day. Attached Images

5 July 2017, 11:42 AM	#3
sea-dweller "TRF" Member Join Date: Oct 2007 Real Name: Dennis Location: Bay Area - 925 Posts: 40,018	Beautiful watch. __________________ TRF Member #6699 (since September 2007)

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7 March 2017, 11:23 PM	#2
statsman "TRF" Member Join Date: Jul 2015 Location: Arlington, TX Posts: 394	That's fantastic work! Very interesting. Is there some significance to "crown down"? I have found my Rolex 1016 does best when I leave it that way at night.

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