Securities purchased pursuant to this article shall be under the care of the Mayor and City Clerk and shall be held in the custody of a state or national bank or trust company, or shall be kept by such officers in a safety deposit box of the city in a bank or trust company. Securities in the original or receipt form held in the custody of a bank or trust company shall be held in the name of the city, and their redemption, transfer or withdrawal shall be permitted only upon the written instruction of the city officers. Securities not held in the custody of a bank or trust company shall be personally deposited by such officer in a safety deposit box in the name of the city in a bank or trust company, access to which shall be permitted only in the personal presence and under the signature of two of the abovementioned officers.