In counties of the first class authorized to borrow in anticipation of revenue pursuant to section 50.065, the notes authorized pursuant to section 50.070 shall not be issued until after the anticipated revenue for the year has been estimated, as herein provided in section 50.110. The total principal amount of such notes issued shall not exceed ninety-five percent of the total anticipated revenue in any such county in any one year but in no event shall said notes be issued if there be on hand general revenues sufficient to pay the general operating expenses of the county. Tax anticipation notes issued by counties of the first class pursuant to sections 50.065 and 50.080 shall be entitled “(Name of county) County Tax Anticipation Note” and shall not be further identified as to a particular county fund or purpose.