This is the only advertisement known to exist for a Waltham black dial from December 9,1917.
Lately I been interested and looking at Waltham black dials.
This is my opinion and I'm no expert just a novice who likes vintage watches.
Could it be that we have been mislead by this advert into thinking is a black dial?
In this particular ad it mentions that it is a radium dial it does not give you a choice.
You can not see the manufactures name or the sub dial.
There is a shadow over the strap and maybe the case unless it was colored black.
Could it be possible the ad forgot to quote that it is a look at a radium dial at night.
I'm viewing a watch that glows in the dark
Maybe I have to much time on my hands lately.
What's your opinion?