Hi Art,
It is possible that the distributor at the time held it in stock for a while so was probably as new much later. They did buy quite a few of them. Considering it is a Campion it will not have differed much at all. we seldom change things unless absolutely needed or we really do make a leap in performance. In the Campion's case this happened years after that and most of the changes were due to component obsolescence.
I personally have a Mark 1 Campion and Mark 2 Byron(and a pair of Penaudio Rogue 6) in my office at home and I listen mostly through that one. The kids have the newer stuff. The Vintage combination I have is actually sweeter than many a 10k+ system I have heard. So I wouldn't be too concerned. To the wiser collector the older Sonneteers fetch a fair bit second hand. But few part with them.
Haider