A mutual casualty insurance company, organized under the laws of any other state or country, and having by its charter the power to transact the insurance business specified in section two hundred two, subdivision (c), in order to be licensed to transact the classes of business mentioned in section two hundred two, sub-paragraph (c) shall have a surplus over all liabilities, including unearned premium and loss reserves, of not less than the capital required of a domestic stock company to transact the same kinds of insurance.
40 P.S. § 871