I guess the answer is that it is worth what someone will pay on the day. If it was for sale in the UK bike press today I’d suspect something like £5500 private and another £1000 if it was from a dealer based on prices over the last few months. Of course that is my opinion, others may differ and perhaps may add a thought here to give some more guidance.
Scott prices have been rising quite steeply in the last 2 years after many years of what I considered undervalued prices. I’d estimate prices have gone up ~50% in the last 18 months for Scotts and the general classic/vintage bike market (Vincents/Broughts etc excluded..) has risen at least 30%.
Take my thoughts as you will, in the end pay what you think it is worth to you as the classics market is not immune to crashes like happened in the early 1990’s.
Regards,
Richard