Frozen dated Mandate cancel on interim mail: undated May 1948 period local TEL AVIV registered mail, franked 25m per period rate, using interim franks & tied by 2x strikes of the local interim postmark (none on the back - unusually, for registered mail); backstamped 5 MAY arrival using the double ring Mandate bar cancel - this being a "frozen dated" device (set to the last date of the Mandate postal service) serving as a confirmation of arrival (and not as a dating device) - this procedure was in place in TEL AVIV from 6-14 May though usually in conjunction with the traditional multiple strike of the interim device of the dispatching office on the back as well; slit open at top.