Re: How were annunciator panels signwritten?
Most were hand-written. At one time signwriters were worryingly capable and could do an entire shopfront or side-of-a-delivery-van pretty much by eye (OK they may have used string and chalked-out a curve to follow for the lines of the "Joseph N. Bloggs and Son Family Butchers" masthead but the rest of the infill was done by eye).
It took some skill to do it in mirror-writing on the inside of the shopfront's glass!
Small stuff like annunciator-panels would probably have been subbed to an apprentice, along the lines of "When you've painted a thousand of these little jobs without mistakes we might let you do something bigger".
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