One gaveled [sp] at 600,000 Euros last year. I believe the exchange rate was 1.15 at the time, making it approx $700,000 USD.
At today's exchange rate, 600,000 EUR = $674,612. USD
Hagerty's valuation is
way under real world market prices
https://www.hagerty.com/apps/valuationtools/1964-porsche-911