WatchTech

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 ...  

I have no idea about watch mechanics so if I get this right, I will be very shocked

"It's that time of the month!"

is it the calendar system from that?

Tides Complication... belonging to Corum?

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... 

It’s a digital day of the month indicator with separate wheels for the first and second digits. No idea who the manufacturer is.

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"...  

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.

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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 ...