I asked for quotes for my 7 from Hagerty, Grundy, Geico, Progressive, and a few others. For Grundy and Hagerty, I asked for collector car insurance, minimum coverage, one driver, garaged, low mileage, driver owns other cars, etc. $24k value of car.
Annual collector:
Grundy - $334
Hagerty - $1,420
Annual full coverage:
Geico - $700ish (bundled with my other cars)
Hagerty does not seem to be a serious company and Grundy has been a hassle to deal with.