Pfaff stretch & jeans 6091
Home Pfaff Sewing Machine CompanyPfaff Questions, Answered. Pfaff Questions Answered by Graham Forsdyke ISMACS News Issue No. 56 July 1997. It's fairly easy to date Singer machines from the serial numbers but other makers cause more problems -- and more questions to the ISMACS mail and internet query services.. Pfaff machines are popular in the USA and until recently we had no way of dating.