Good point -- I'm just being lazy with my wording. All I mean is "not a unique, custom-made frame" but rather something that was available off the peg, or on a catalogue, mass- or nearly-mass-produced, or however you want to put it.
I am aware that until the 1960s countless artisanal frame builders in France, for example, ran dynamo wiring inside their frames. Today, countless $2000+ custom made frame sets can be had with dynamo wiring. But I am trying to trace the everyman, relatively cheap, mass-produced frames (especially touring frames) that had this feature in the bike boom era.

There is no special reason for this curiosity either: simply, I like rebuilding 1980s touring frames (usually Miyatas and Univegas) with modern components and I had always just accepted that I had to run the dynamo wire externally. Then recently I acquired a Centurion Pro Tour frame and I was shocked to see the dynamo holes. Then I noticed it on the Specialized Expedition. So now I am wondering what else have I been missing out on...