Does it show the week of the year, changing every 7 days? [nt]

Jul 21, 2019,09:23 AM
 

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Movement Quiz #2: Guess the complication?

 
 By: skyeriding : July 20th, 2019-22:35
I've done this more than a year ago, now time for the second instalment! What is the complication shown here? Bonus points if you can identify the movement and watch brand! Image taken from khepri__watch_repair_horology, on Instagram. Regards, skyeriding ...  

Perpetual Calender or annual calender?

 
 By: Spencer Karrington : July 20th, 2019-23:46
I have no idea about watch mechanics so if I get this right, I will be very shocked

A menstruation tracker!?!

 
 By: Spangles - Mr. Tabby : July 21st, 2019-09:21
"It's that time of the month!"

For if a month has 30 or 31 days? [nt]

 
 By: Spangles - Mr. Tabby : July 21st, 2019-02:09

I know the MIH has a strange system,

 
 By: thegrailwatch : July 21st, 2019-03:00
is it the calendar system from that?

Me Trying Again...

 
 By: thegrailwatch : July 21st, 2019-07:19
Tides Complication... belonging to Corum?

It has to do with a 24h circle, because of 24 teeth

 
 By: COUNT DE MONET : July 21st, 2019-03:31
However, every eight teeth a different tooth design. A complication every 8 h ...? It is not a moon phase wheel, that is clear. Regarding brand: looking at the decoration and finish, it is a Swiss brand but nothing like Patek or VC, ... something less exp... 

Solunar? [nt]

 
 By: ektaylor : July 21st, 2019-06:32

Ok. There are nine spaces between the different gears, which means one wheel is counting 1 to 9. There are 4 “different gears” which means there's another wheel on top (or underneath) counting digits from 0 to 3.

 
 By: ektaylor : July 21st, 2019-08:15
It’s a digital day of the month indicator with separate wheels for the first and second digits. No idea who the manufacturer is.

And we finally arrive at our answer!

 
 By: skyeriding : July 21st, 2019-10:06
It is indeed, a bigdate complication, which has separate discs for each date digit. This particular version is found in Zenith's El Primero bigdate movements. Image from: forums.watchuseek.com Lets call the gear in the photo as the "central wheel"...  

Well done for this quizz! Very interesting and great to challenge our minds on technical questions!

 
 By: eklektik : July 21st, 2019-12:52
I am a bit chocked by the "dirtiness" of the main plate. Is that an old movement? Zenith should produce systematically with higher quality nowadays with decent numeric machines. Best, É.

Tidal complication? [nt]

 
 By: dedestexhes : July 21st, 2019-08:07

No, here it is,

 
 By: amanico : July 21st, 2019-13:50
...  

Amazing execution; you can understand why these vintage Heuers are so desirable.

 
 By: jlc.thomsen : July 21st, 2019-20:31
Would like to understand how the lunar day of 24:50 hours relates to the tide wheel and the earth time. Wonder if they made 2 movements- one for earth time and one for moon time ...