and 414 ohms seems way low for a ~60k nominal secondary. Would normally expect something in the mid thousands, typically around 3.5k - 6.5k
Again, yeah. More likely to see in a modern transformer versus an old one, but still rare. I'm usually suspicious if I see less than 1K5, what with the usual (PRR) rule of roughly 10% for DCR versus Ω.
Bench test for level into a hi-Z DI would be my next test, see what it really delivers, out versus in.
Then there's the other direction seen in some Western Electric, Langevin, and RCA, of really high DCR, like up to 75% of rated Ω. I still haven't found anything informative about that design decision.