Note sure how far to take this, but Forbes opined about Volvo P1800s in their December 2014 issue:
BUY: Volvo P1800
Volvo made a splash in sports cars with the 1961 introduction of the P1800--combining bodies from England's Jensen Motors and the proven Volvo B18 power plant. The P1800 was built from 1961 to 1973, but many ended up in the scrap yard because of corrosion problems. Prices are now on the rise, and $100,000 could soon be the norm.
$100K, eh? And soon be the “norm”, no less. Now, I’ll agree that prices are on the rise. I’ve had mine for over 4 years now and I estimate, based on the prices I see being paid, that 64SAINT is probably worth twice what I paid for it. Maybe more, especially given the amount of mechanical work it’s had done on it coupled with no corrosion at all. But that ain’t nowhere near $100K.
However, I will certainly increase the insurance coverage on it next year when I collect it from its winter storage. If someone totals it, it’d be nice to have enough cash to buy another equally as good. And that will cost.