R.L.O, Return Letter Office cancelled on back of cover, Airmail cover from Switzerland, Helvetia, Pakistan Postal histor

R.L.O, Return Letter Office Cancelled On Back Of Cover, Airmail Cover From Switzerland, Helvetia, Pakistan Postal Histor - Pakistan
R.L.O, Return Letter Office Cancelled On Back Of Cover, Airmail Cover From Switzerland, Helvetia, Pakistan Postal Histor - Pakistan
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