Dura Ace genuine antique five speed freewheel 14 - 18 tooth, five speed. 14/15/16/17/18. Freewheel mechanism feels fine, nice and clicky and engages alright. The teeth as you can see in the photos are nice and chunky and will probably last forever.I don't know for sure, but I'm guessing this is from 1974. £14 by recorded post in the UK.