Hi the problem is either as clockboy said the arbour is slipping or or the mainspring has broken at the outer end allowing the spring to retain enough tension to drive the watch for a while. I have attached two documents should you wish to dismantle and repair the watch your self. good luck. Cheers
Hi nice to see it up and running again, well done you, and also the history, brilliant. So Its come full circle, It was shame about the Dundee factory but that was the climate in the 70s . I am still of the opinion that they were innovative movements at time and great to see there is still an interest in keeping them alive .