Amir Avitzur asks about hubs and rims for 1948 and 1959. Here are some datapoints.
1949 Holdsworth Aids to Happy Cycling (I don't know if a 1948 catalogue was printed)
Holdsworth Allez alloy hubs Bayliss Wiley alloy spoke flanges, rear hub double fixed Bayliss Wiley Steel hubs, rear hub double fixed Bayliss Wiley rear freewheel hub Chater Lea alloy hubs, rear double-sided Harden hubs, single and double sided rear hubs, for fixed/fixed, fixed/gear
K.P. "Kronj Prinz" alloy, 26 or 27 Dunlop alloy sprint (tubular), 26 or 27 Constrictor Conloy RR 56, 26 or 27 Weinmann hollow pattern, 27 Weinmann lighter gauge alloy with wood insert, 27 D'Alessandro wood, 27
1959 Holdsworth Aids to Happy Cycling
Campagnolo FB, alloy flanges on steel barrel, small and large flanges Chater Lea, small flange, rear fixed/fixed or gear/fixed British Hub Airlite, steel barrels, alloy flanges, large and small flanges British Hub Solite, small flange only Bayliss Wiley Alloy small flanges, steel barrels, Fixed/fixed and gear/fixed Bayliss Wiley Steel small flanges and hub, fixed/fixed and gear/fixed Bayliss Wiley Large flange Continental, fixed/fixed, single gear, and gear/fixed
Fiamme sprint (tubular) road 14 oz or track 12 oz, 32/40, 36/36, or track-only 38/28, 27 Mavic sprint (tubular) Weinmann sprint (tubular) 27, or woodlined Constrictor Conloy sprint (tubular) Fiamme wired-on alloy, 27 Weinmann wired-on Alesa with dimpled spoke holes, 27 Weinmann wired-on Alesa with non-dimpled spoke holes 26 Endrick wired-on 26 or 27 Constrictor Asp wired-on, 26 or 27 Constrictor Cobra wired-on, 26 or 27 Constrictor Viper wired-on, 27 Constrictor Boaloy wired-on, 26 or 27
La Jolla California USA