Rex Lex wrote:
I am interested to hear what others say as well. I've read on forums that the longer 'hash marks' on the minute subdial of chronographs (at 3, 6, 9 minutes) were used to help time long distance phone calls, since they were billed in 3 minute increments. I'm not sure if that's undisputed or just a theory. Also, so the story goes, watchmakers stopped marking dials like this in the late 1940's or so because long distance stopped being billed like that.
If the above story is true, then it's odd this Top Time has these marks.
For reference, I've seen these 3-6-9 marks on the minute subdial of other 810 references. Specifically the panda versions. However, I have not seen these marks on the white on black reverse panda reference. I've linked the thread below that shows WatchFred's great collection of 810.
viewtopic.php?f=11&t=52706