650 Bonneville serial # Home › Forums › British Motorcycles › Triumph › 650 Bonneville serial # Viewing 4 posts - 1 through 4 (of 4 total) Author Posts 2008-06-16 at 2:05 pm #11912 lowriderMember Hi there ,I just picked up a 650 bonneville TI 120. The guy I bought it off of thinks it is a 1967, but the serial # on the frame DU 35214 indicates via listing on the web as being a 1964.Can anyone help me out on this? Thanks 2008-09-08 at 3:42 pm #13608 mgpezzanaMember I’m late but perhaps in time. Check the engine number. It should be between H40520 and H49832. Your motorcycle is dated 1966. Congratulations. mgpezzana 2012-11-11 at 8:50 am #13609 goferMember Four and a half years later …………………. your machine is a 1966 T120. All T120's for 1966 were within the following serial number range DU24875 – DU44393. Sorry for the late reply, haven't been on this site for ages. You have probably sold the bike by now? Gordon 2012-11-14 at 4:29 am #13610 0987DAVEParticipant More info here: http://www.bikelinks.com/directory/Classic_Motorcycles/A_to_Z/T/Triumph_Classics/Triumph_Serial_Numbers/ Author Posts Viewing 4 posts - 1 through 4 (of 4 total) You must be logged in to reply to this topic.