How dangerous?
I'm interpreting this passage from
http://www.pixelp.com/gruen//1894.html :
"Fred Gruen claims to have introduced the use of applied numbers and markers on watch dials. In the 1800s and early 1900s, watch dials were enamel with painted markings. After looking at very old clocks and watches in European museums, Fred decided to do some metallic dials with gold applied numerals. The firm that Gruen contracted to make these dials initially resisted the idea, but they quickly became very popular and were soon copied by other manufacturers. From the 1930s through the 1960s, almost every watch manufacturer in the world used a metal dial with applied figures on at least some of their watches. Although he had taken out many patents on behalf of the company, Fred later regretted not having taken out a patent on applied dial figures."
Would it be as dangerous to apply the rule to the time period before Gruen reintroduced applied dial indexes?
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