Section 1289(b) in Police Regulations, Bengal , 1943
(b)A separate pay-cheque book in Bengal Form No. 50 shall be maintained for stamps issued. The pay-cheques shall be prepared in duplicate and the stamps sent (if by post, in a registered cover) with a duplicate copy of the pay-cheque. The officers receiving them shall return the receipted cheque which shall be filed in the ordinary way. The number and date of the pay-cheque shall be noted in the stamp register to facilitate checking.