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NOTE: This numbering system apparently ran until 1955, possibly longer, and concurrently with the newer serial system that debuted in 1948 (shown below). Digits or letters in serial do NOT relate to month/year/day codes only the serial in whole determines the year.
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"T" serials replaced "P" serials sometime mid-year 1950. Three serial conventions are used during this period:Ħ digits followed by the letter "P" or "T." "P" serials used until and during 1950. Serials stamped on side of seat lug (men's), front of seat lug (ladies', not shown), or bottom bracket (men's and ladies,' not shown), positioning of serial has no relation to serial system - there does not appear to be rhyme or reason relating to positioning. 1973 - Grand Prix, Super Course, Grand Sports only
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