1964 untaxed 'top of the pile' taxed-franking cover: 15-10-1964 printed matter commercial cover from TEL AVIV branch of Idud Ltd. mailed unfranked and postmarked as such by post office(!), but returned to sender as address unknown (cachet on front); as envelope is printed at base "return payment guaranteed", this letter and all others to same addressee returned together with total tax calculated and applied to one of the covers placed at the top of the pile - here, charged 224 Agorot, the DO-11 period 8 Ag return fee (same as the sending fee) for 28 letters (per manuscript "28 x 8", confirming this cover not taxed - otherwise it alone should have been taxed twice the deficiency + 1x the return fee) and paid for using 4x 0.50L & 2x 0.12L 1961 Zodiac Ba210/215 franks tied by 2 strikes of 20-10-64 TEL AVIV-6 postmarks. Unusual postal handling.