1931 Horn Variants

Style #1 Style #2 Style #3
This style is the one most commonly seen. This style is the least commonly seen. This style is slightly more common than the one with holes but much less common than style #1.

So what's the story? Are slots correct? Are holes? During their waning days, did Henderson just buy whatever horns were available at a good price? Is one style correct for a KJ and the others for some automobile? Does anyone have period literature showing the horn? Let's hear what you think!