Section 9. When an impressed stamp is used under section five to denote the amount of duty with which any instr

49. When an impressed stamp is used under section five to denote the amount of duty with which any instrument is chargeable, such amount shall be denoted by a single stamp, except when such amount exceeds one thousand rupees, in which case it may be denoted by two or more impressed stamps of which the aggregate amount is the amount so required: Provided that, when a single impressed stamp of any amount less than one thousand rupees is not procurable on application to the Collector or stamp-vendor appointed under section forty-eight, it shall be lawful, on such officer making a certificate to that effect, for the person requiring such stamp to denote the amount by two or more impressed stamps, of which the aggregate amount is the amount so required.