I'm running the stock pair of 103-LX, that came in my '57 Khorns.
They sound great.
Of course, they were implemented in a mono configured cabinet.
That might say something about the design application, but I really can't comment on the specs.
I don't have the particular "dope from Hope", in front of me, but I do recall that PWK had suggested that it be retained for continued use after the 1958/60 modification period.
IMO they are really well made drivers.
Though, i'm biased in the fact that i'm a Stevens/Tru-Sonic fan.
Even if they couldn't keep their building(s) from burning down....they still made some serious drivers.
Good sound is good for the soul.