WWI Austro-German military post: reg. cv ex Austrian "Liquidierender Rechnungsf�hrer der | ...

WWI Austro-German military post: reg. cv ex Austrian "Liquidierender Rechnungsf�hrer der | k. u. k. Gebirgshaubitzdivision v. Marno" [Paymaster of the Austrian von Marno Mountain Howitzer Division; 2-line violet cachet on front] in PALESTINE to War Ministry, VIENNA, dispatched 21-4-1917 by German military post w/pmk A.O.K. 4 (Ba M-6/FPOP 253) & marked by rare R-Label "Milit�r-Mission Feldpost 4. Armee" [4th Army military mission field post] Ba R-40-3. Unfranked, as military mail: handstamped "einschreiben" & "Portofreie Dienstsache"; b/s by special cachet of Austrian "Liquidierender Rechnungsf�hrer von Marno" + 2 strikes of 12-5-1917 scarce German military Constantinople transit mark MIL. MISS. KONSTANTINOPEL (Ba M-5/FPOP 251). Opened at top and right; fine and rare. Est value $5400+