Section 90A. No policy shall be issued by a mutual company formed to transact business under the third clause of section forty-seven, or under clause (b) or (c) of section forty-eight A, and having no guaranty capital or having a guaranty capital of less than the combined capital and surplus provisions required under section forty-eight, until not less than one million dollars of insurance in not less than four hundred separate risks upon property located in the commonwealth, in case of a company formed under said third clause or said clause (b), or not less than two million dollars of insurance in not less than eight hundred separate risks as aforesaid, in case of a company formed under said clause (c), has been subscribed for and entered on its books and the premiums thereon have been actually paid to it in full in cash.