O/T Retrograde Watches

[lawros left foot]

I have bought a second hand retrograde watch, however it came with no instructions.
I understand how they work, and that the half dials can be for a variety of functions (date, battery lie etc) but the dials on mine are from 1-31, which you would think would be the date, but the graduation is 1,7,13 ,19,25,31.The lower dial has a graduation scale of 0 to 24 increasing in a scale of two. I haven't a clue what these dials are for, and appeal to the vast collective knowledge of NSC, to educate me

 

[madinthehead]

I would guess 24 hour clock and as you said 31 day date..

As not all the numbers can fit on , it is graded so that you can see it
The dots between 1 and 7, would be 3 and 5, in between the dots would be 2, 4, 6..

 

[lawros left foot]

That all makes sense, I will set it up and see if it works.

Thanks