is sold by the post office, if the postal order is not brought to the post office for payment within 6 months from the last day of the month of sale, a second commission will be charged as per the rate prescribed in sub-rule (2) of rule 40 and this commission shall be paid by affixing a postage stamp on the back of the postal order. will fall Payment of postal orders will not be made if the payment is made after 12 months after the last day of the month of sale.