
@fluxed Note that the history of the term “the real McCoy” is unclear (https://en.wikipedia.org/wiki/The_real_McCoy).
But the Wikipedia article agrees that Elijah McCoy may be the real “real McCoy”.
@fluxed Here's a write-up from an Ypsilanti, MI newsletter on Elijah and his invention which goes into the "Real McCoy" debate. https://aadl.org/ypsigleanings/19527
Tl;dr, the ads for Mackay's whiskey used the phrase in the 1850s, while the first use of the phrase for McCoy's oiler wasn't until the 1870s. Both items were popular and broadly known and respected. Since there's no records tracing the use of the phrase, there is no way to say which is the basis for the common, popular usage.
@fluxed nobody's really sure of that.
I still think it originated as a different pronunciation of "the real mackay" referring to a scottish whiskey since bearing lubrication on trains is too niche a thing for the saying to have spread very far into the general population, whereas whiskey is much more common a thing to know about
Wow. TIL!
That's brilliant.