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You might check with Grundy, you can get an online quote very quickly. They saved me money over Hagerty and anyone else that I got quotes from. Have been with them a while now.
I had Grundy for about 10 years and they too kept raising the premium until I got tired of paying an inflated premium for a "collector car" that sits in a garage.
What happens is you keep lowering your agreed value and the price keeps going up anyway. It's not a fun game to play so I dropped them. I switched to NCM a few years ago and I am very happy with them.
My insurance rates on cars and my house doubled this last year - Washington state insurance commissioner made it "illegal" to use credit scores to discount insurance since it's discriminatory, according to him... Fortunately, a judge just overturned this change so my credit score can be factored into a reduced rate.
You might see if your state has a similar moratorium on using credit scores due to "the pandemic."