She was built at Robertsons of Sandbank who are now defunct.
I believe that Dr Jeremey Thomson was a crew member in her original days and may be able to provide more info. He was the GP in Tighnabruaich and still lives in the village.
Berthon Boatyard at Lymington did some of the work to adapt her for cruising and might have some records.
I think the mast was moved before then, though.
It was good to see Sceptre at Troon last Spring... was the buckling the problem then? There seemed to be a lot of activity below as she sat on the hammerhead.