I tried some on recently and whilst they are a fantastic heritage shoe, unfortunately I think my legs would crumble if I wore them to play.
But they are a good fit. Seemed true to size for me. I am a UK 8 and they were spot on. Unlike modern Nike tennis shoes where I a half size bigger.
Have you seen the re-issue Nike Tennis Classic (Wimbledon) too, not the re-vamped modern ones? Great off-court shoes.
"Tennis is just chess with balls....zugzwang"
Dunlop, Prince....who knows...who cares.