Hi Brian that is a great picture should have kept the haircut ! You have a white one. I think refinishing it to the original would still make it non original and would not add a great deal of value depends on whether you do it yourself or not. I noticed the all original red ones fetch between £100 - 150 more than the ones which have been stripped back
Paul Day had a white one which got stripped back and he is going to put it back to white in the future. I am sure he will do a great job and hope he will post the finished result on here. Nostalgia is worth a lot