N.Y. Second Class Cities Law § 68

§ 68. Treasurer and deputy treasurer. The treasurer may appoint, to\nhold office during his pleasure, a deputy and such other subordinates as\nmay be prescribed by the board of estimate and apportionment. In case of\nthe absence or disability of the treasurer, or of a vacancy in the\noffice, the deputy shall discharge the duties of the office until the\ntreasurer returns, his disability ceases or the vacancy is filled. The\ntreasurer and deputy treasurer, before entering upon the discharge of\nthe duties of their respective offices, shall each execute and file with\nthe city clerk, an official undertaking in such penal sum as may be\nprescribed by the common council. Such undertaking, when approved as\nprovided by law, shall have the same force and effect, and shall be\nfiled and recorded in the office of the county clerk of the county in\nwhich the city is located in the same manner as is required in the case\nof an undertaking of a town collector.\n