I have read this thread with much interest and would agree with JimR that the guitar is not 60's.
However I can't make out if there is a volute or not...does not look as if there is one. What does that tell us ito dating it ? Surely early 70's at the latest ? But then there is the absence of the varitone hole in the tailpiece which dates it (from Jim's post) to 1975 and later. Surely one would expect to see a volute then ?
But all in all, I love Hannu's S400,refin'ed or not....I think it's a stunning looking axe.....and I bet it sounds great !