I have one of those "slow" watches that has just one hand, going round
once every 24 hours.

This is a cheap one, from "Jiandum". It has the one hand and a
mechanical date ring. The mechanism is electronic quartz crystal, though
how much of it is derived from a conventional watch or how much special
I don't know.

Anyway, it has been working properly for over a year, with a single
battery change in that time, which was obvious because it just stopped.

Now, suddenly as of a few days ago, it has gone wildly wrong. The hand
is going at double speed, making a complete rotation in as close as I
can tell exactly 12 hours instead of 24.

From listening to it, it is still ticking once per second, so the
electronics seem to be OK.

This is the odd part, the date ring is still moving once per day, and
changing at the correct time of day. It's as if the date is being driven
from a movement that is still once per 24 hours while the hand is going
twice as fast. One might have thought it would just be driven from the
movement of the hand.

So, how might the watch be arranged inside? It looks as though it's a conventional watch with some sort of special gubbins to create the once
per 24 hour hand. Any guesses as to how that might have been done and
how it might be capable of going double speed while the rest continues
as normal?

nib

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On 2025-05-20 09:30, Tricky Dicky wrote:

nib <news@ingram-bromley.co.uk> wrote:

I have one of those "slow" watches that has just one hand, going round
once every 24 hours.

This is a cheap one, from "Jiandum". It has the one hand and a
mechanical date ring. The mechanism is electronic quartz crystal, though
how much of it is derived from a conventional watch or how much special
I don't know.

Anyway, it has been working properly for over a year, with a single
battery change in that time, which was obvious because it just stopped.

Now, suddenly as of a few days ago, it has gone wildly wrong. The hand
is going at double speed, making a complete rotation in as close as I
can tell exactly 12 hours instead of 24.

From listening to it, it is still ticking once per second, so the
electronics seem to be OK.

This is the odd part, the date ring is still moving once per day, and
changing at the correct time of day. It's as if the date is being driven
from a movement that is still once per 24 hours while the hand is going
twice as fast. One might have thought it would just be driven from the
movement of the hand.

So, how might the watch be arranged inside? It looks as though it's a
conventional watch with some sort of special gubbins to create the once
per 24 hour hand. Any guesses as to how that might have been done and
how it might be capable of going double speed while the rest continues
as normal?

nib

Have you accidentally gone into a settings menu and set it to 12hour cycle instead of 24hour?

Don't think so. The only setting is the crown, which has the usual
half-out to set the date and full-out to set the time.

I was wondering if it could be a twin-motor movement, where normally the
second hand with its own motor could be re-purposed as a stop-watch, but
here re-programmed as a 24h hand, then some sort of motor error making
it move 2 steps for each pulse. But sounds unlikely.

nib

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

nib <news@ingram-bromley.co.uk> wrote:

I have one of those "slow" watches that has just one hand, going round
once every 24 hours.

This is a cheap one, from "Jiandum". It has the one hand and a
mechanical date ring. The mechanism is electronic quartz crystal, though
how much of it is derived from a conventional watch or how much special
I don't know.

Anyway, it has been working properly for over a year, with a single
battery change in that time, which was obvious because it just stopped.

Now, suddenly as of a few days ago, it has gone wildly wrong. The hand
is going at double speed, making a complete rotation in as close as I
can tell exactly 12 hours instead of 24.

From listening to it, it is still ticking once per second, so the
electronics seem to be OK.

This is the odd part, the date ring is still moving once per day, and changing at the correct time of day. It's as if the date is being driven
from a movement that is still once per 24 hours while the hand is going
twice as fast. One might have thought it would just be driven from the movement of the hand.

So, how might the watch be arranged inside? It looks as though it's a conventional watch with some sort of special gubbins to create the once
per 24 hour hand. Any guesses as to how that might have been done and
how it might be capable of going double speed while the rest continues
as normal?

nib

Have you accidentally gone into a settings menu and set it to 12hour cycle instead of 24hour?

--- SoupGate-Win32 v1.05
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On Thu, 22 May 2025 21:05:43 +0100, Dave W wrote:

On Tue, 20 May 2025 08:09:10 +0100, nib <news@ingram-bromley.co.uk>
wrote:

I have one of those "slow" watches that has just one hand, going round
once every 24 hours.

This is a cheap one, from "Jiandum". It has the one hand and a
mechanical date ring. The mechanism is electronic quartz crystal, though >>how much of it is derived from a conventional watch or how much special
I don't know.

You make it sound as if everyone has heard of such things, but it's new
to me. How can you read the time accurately if the hours are spaced so closely? What is the model number so that we can Google it?

They are called 'slow watches' and there are lots of them, so just Google
that term. They are aimed at a more relaxed lifestyle and can show time to
a fairly good approximation.

Here's an example:

https://uk.slow-watches.com/




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On 2025-05-22 21:05, Dave W wrote:

On Tue, 20 May 2025 08:09:10 +0100, nib <news@ingram-bromley.co.uk>
wrote:

I have one of those "slow" watches that has just one hand, going round
once every 24 hours.

This is a cheap one, from "Jiandum". It has the one hand and a
mechanical date ring. The mechanism is electronic quartz crystal, though
how much of it is derived from a conventional watch or how much special
I don't know.

You make it sound as if everyone has heard of such things, but it's
new to me. How can you read the time accurately if the hours are
spaced so closely? What is the model number so that we can Google it?

Here's one, but there are several, ranging up to ludicrously expensive:

https://www.amazon.co.uk/JIANDUN-Movement-Single-Italian-Leather/dp/B09PYSN1SJ

This is the cheap end.

The idea is that you don't really need to know the time very accurately
and just seeing that it's getting near 16 o'clock or whatever is all you
really want.

I've since found that it uses a Swiss OEM movement from Ronda, their
515-24H. It's designed to have 4 hands: hours, mins, secs and 24h but
this watch fits only the 24h hand.

I took the battery out, measured it as 1.4V so not flat, put it back and
then it didn't run at all. I suspect something failed mechanically.
Anyway, the strap was getting to look a bit worn, the not-very-hard
glass was scratched, and I have another similar but better watch, so it
got taken apart just to see how it was put together.

nib

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