Any municipal corporation which had only volunteer firemen prior to January 1, 1967, may operate and maintain a volunteer firemen’s relief and pension fund, and levy a tax of up to three-tenths of one mill upon all the real and personal property listed for taxation in the municipal corporation for the purpose of providing funds for the payment of benefits and pensions from the municipal corporation’s volunteer firemen’s relief and pension fund, provided such a tax was levied prior to January 1, 1967.