The stamped numbers are generally the date and month of production, or so it is assumed. this seems to hold true. 3 and 2 might mean 1973, February? The stock medallion on this one is the while plastic which is early 1970s, later replaced by the stamped metal foil one with 'Milbro'. This model wet through various iterations, dark and light stock stains and the stock form altered with fashion. This is consistent with the early 1970s date. Milbro were nothing if not practised at selling he same thing in a new wrapping.