The tires are actually labeled Challenge, not Challenger. Per French language LeCycle, the tires read: "challenge (all small case red letters in white band, the g is black and has a roadway-look schematic hook to it) Criterium 28" hand made press 7-9 bar (white lettered in red band) PPS (red letters in white band)".
The listed weight is 213g. PPS = sous-couche anticrevaison.
Ken, in the rain near St Louis