At the expiration of thirty days after the date of the first publication of the treasurer’s notice referred to in Section 13.48.050 of this chapter, the city treasurer shall report to the city clerk the total amount of the assessment, the total amount paid to him to redeem the lots, tracts, parcels of land, or other property, from the assessment levied thereon, and the total amount unpaid on such assessment, whereupon the mayor and clerk shall issue the bonds on the local improvement district established by the ordinance providing for such improvement in an amount equal to the amount remaining unpaid on said assessment roll, as shown by such report. The bonds herein provided for shall not be issued prior to twenty days after the expiration of the thirty days above mentioned. Such bonds shall be in denomination of one hundred dollars each as far as practicable, provided that the city council may in the ordinance confirming the assessment roll designate any different denomination for such bonds. Such bonds shall be numbered from one upwards consecutively, and each bond and coupon shall be signed by the mayor and attested by the city clerk; provided however, that said coupons, instead of being so signed, have printed thereon the facsimile of the signatures of said officers, and each bond shall have the seal of the city impressed thereon, and shall refer to the improvement to pay for which the same shall be issued, and to the ordinance ordering the same. (Prior code § 13.48.060.)