Some of you may recall that a Monday or two ago I posted a 19th-century picture of a gentleman wearing what turned out to be a long-range listening device -my thanks to the Good Reverend for pointing out exactly what we were looking at.
Well, I've come across another example, of sorts, this time on the bookplate of book and type designer W.A. Dwiggins. This dates from the early 1930s-
Very stylish, I think.