State Farm offers Classic insurance. It's much less, they base the rates on maximum miles a given year. The limit on miles is 2,000 per year. The cost should be under 600.00. Try to contact a State Farm Agent. If you normally put 3,000 miles on it maybe you can drive it a bit less and save a bundle.

I'm not sure about the year/age a car would qualify, I have 1978, and 1981 on this type of policy.

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1981 280SL Euro 107
1978 VW Convertible
1984 280SE Euro