Here’s a nice explanation of the items (silence periods) on the clock’s face:
https://g0kya.blogspot.com/2010/09/history-of-ships-radio-room-clocks.html
It looks like there’s an indicator on your clock’s face (between 2 and 3) showing the position of a Fast/Slow adjustment (presumably on the back). True?
Ah - now I see the spot for the winding key on the front (above 6). So maybe the F/S is adjusted from the front...?
That’s a handsome clock - take good care of it :-)
Jeff N0̸MII
Here's a photo of a wall clock I have in the shack. Supposedly it dates to WW2 and was on a Navy ship. Since there's been chatter about coastal stations and such I thought I would post this photo. Note it's marked Mackay Radio. Any old timers seen a clock like this ??