Thanks Ian.....I have managed to find out a bit more, but still researching. mine was sold by Muirs and was a pagewood build. I have it on good advice this may have been part of a dealer promo thing, but that is yet to be varified. there has also been speculation that the trim was done by the factory, as opposed to a local trimmer. mine is also a 4/77 build.
the plot thickens.........