1947/49 war-delayed mail from EIN HAROD to HAIFA taxed 2 years later for invalid frank

1947/49 war-delayed mail from EIN HAROD to HAIFA taxed 2 years later for invalid frank
1947/49 Mandate-State 2 rate-period taxed wartime mail: DEC 1947 commercial cover from MESHEK EIN HAROD to partially written addressee at Religious Youth Village POB in HAIFA posted during Mandate period ( start of War of Independence) and franked 10m using Ba97 stamp per letter rate, and tied by scarce Proud D6/Dorfman-2 postmark; as addressee not found (manuscript bottom front), cover returned to sender over a year and a half later (15-5-49 Haifa postmark on front) but now marked for tax as Mandate stamp now demonetized, using scarce narrow "T" cachet; received at MESHEK EIN HAROD next day where postage dues (double DO-2 period 15pr letter rate) paid 11 days later using 10m & 20m 1st postages dues BaPD3/4 franks tied by full strike of 27-5-49 local postmark. Opened gently at back; very fine and unusual. As Postage Dues were calculated per 2nd postage rate period (starting Oct. 1948), cover probably didn't reach Haifa in 1947-48 and was delayed by the War, as northern Palestine affected by Arab marauders & al-Qawuqji's Arab Liberation Army from late 1947 to 1948.