I'm currently reading
The Missing Ink: The Lost Art of Handwriting, by English novelist Philip Hensher. Not too far along, but find that Mr. Hensher is no lover of Spencerian script and critical of many other things related to handwriting..
In chapter seven he makes the comment that the Coca-Cola logo is rendered in
copperplate. This surprised me since I've seen so many references to this logo having been done in Spencerian, by no less than the Coca Cola Company
https://www.coca-colacompany.com/au/news/trace-the-130-year-evolution-of-the-coca-cola-logo and even Zillers.com
http://zillers.com/learning/spencerian-and-cooperplate/. Yet in this same link on Zillers it is said,
"In general terms, Spencerian hands utilize delicately shaded lower-case letters." Yeah, not seeing
that in the logo.
When I first discovered Spencerian a few years ago, I'd encountered many online references to this logo, and just decided that, because I was so new to scripts and calligraphy in general, I wasn't able to discern it for myself. But today, I have a hard time reconciling those heavy thicks with very little thin contrast with Spencerian. Even Louis Madarascz and his heavy shading has a lot of thins to balance.
It just seems terribly urban mythological to me, and it's doubtful Myth Busters will ever take this one up, so I submit this poll.