These have been talced. I'll upload photos of the tube later today. There's no wear on the outside; it's a manufacturing failure. I'll also cut it open to look at the inside.
Even if you don't talc it, the wear should come under the tread, not on the sidewall.
I found Goodyears for sale at Aircraft Spruce Europe (but they won't ship to the US) and here: $389!!!! These are bent valve stems; the Aero Classics are straight valves.
https://www.aircraftsupply.com/302-339-300.html