I,m with Liberty and they use Safeco to write my Morgan and my motorhome. No restrictions and declared value.
Make sure your "declared value" is an agreed value there is a difference in the terminology and that you will receive full payout if the worst happens. My Moggies are insured with Haggerty, when I blew the M3W engine the new engine cost $10,000 which was covered by the policy minus the deductible of $1500, I was quite pleased with that.
As an aside a friend of mine got hit by a Deer while riding his BMW Motorcycle which was totaled, luckily for him his leathers saved the day except for a broken arm. Anyway Progressive paid out just under half of the purchase price of the bike which was six years old a cautionary tale on what are values and not, its all in the small print.