Accuracy of 1858 Tachymeter

Jan 21, 2021,15:00 PM

Hi all,
For those of you who own the 1858 Tachymeter, how accurate is your piece? Mine seems to be slow close, at 18 seconds a day. That sounds like quite a lot to me.
Any thoughts?

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When I had it, mine was mostly -24 hours / day.

 By: MichaelC : January 21st, 2021-15:15
Sorry, could not resist bagging on old #99.


 By: amanico : January 21st, 2021-23:59


 By: amanico : January 22nd, 2021-12:49

my green 1858 (caliber 13,21) is at +2 seconds/day

 By: penfriend : January 24th, 2021-13:16
but you have to wear it on the wrist fully winded, not lying on the desk

yes - that is correct

 By: penfriend : January 25th, 2021-00:53
each watch moves differently depending on the side it is positioned (there are four possibilities obviously). Accuracy can only be measured on the wrist because there the watch is always in different positions. some are faster and some slower - the mixtur... 

to add one experience figure:

 By: penfriend : January 25th, 2021-08:04
when the watch is on the desk with dial side up this is in my experience the fastest position (on average 5-10 seconds quicker than on the wrist measured over 24 hours)

that is too much and strange as well

 By: penfriend : January 26th, 2021-00:29
you must get it checked; either with MB or some watchmaker who is able to measure the amplitude. if all parts are technically ok they can regulate it pretty easy by opening the case and using the adjuster

Silly question

 By: KL670 : January 26th, 2021-15:23
I have another rather obvious question. Does a mechanical (not automatic) watch tend to run slower when it’s close to the end of its power reserve? At least that’s what I’ve noticed in my 1858 Tachymeter. After I took Nico’s advice and demagnetized the wa... 

Yes, that is the case indeed (not only with Villeret/Montblanc)

 By: penfriend : January 27th, 2021-01:49
Thus the suggestion is to wind it back to max every morning in case that you wear the watch on a daily basis for some time.

I would wear it for at least three months regularly...

 By: penfriend : February 9th, 2021-03:13
and see how it develops during this time span. Sending it to Suisse is quite an effort in case that they don't want to regulate it locally. Sometimes with regular wrist presence these datas can change. When you go back to your AD in April/May and it has n... 

Good to read - I am happy that it has resolved

 By: penfriend : February 23rd, 2021-23:31
+1 is perfect so enjoy the timepiece in good health!