Hi Chris, the Dawes serial numbers are a lost cause, I don't think there is an explanation to them without a factory ledger, which I believe were lost in a fire or something, I have just seen similar Dawes with the serial number in that position, hence my direction, my 1936/7 Dawes has a 'P' as a prefix, there is a 36 is at the end but having seen other Dawes it is not a year code, just a coincidence. Good luck with it, Dawes do deserve some respect, they are usually hand built, made to a very good standard, and much loved. Thank Terry