Insured values, rates and types and amounts of coverages vary widely depending on what state one lives in, one's DMV violation and accident records, and that State's insurance regulations (laws). Here in NY State only companies licensed by the State can offer policies. Here, to avoid the intentional over-valuing of insured property, the insured value of each vintage/classic car (over 25 yrs-old) must be established at the start of the policy by a professional car appraiser licenced by the State, and of course there is a fee for that.
My '47 was appraised at over $22,000 and the current annual premium is $342 with Metlife Auto. There is no limitation regarding mileage driven, locations where driven, nor where/how the vehicle is stored.