Canada, 1918, Field Post Office / Siberian Exp. Force, stampless cover with somewhat lightly struck cds "Field Post Office / Canadian / Siberian Exp. Force" with date MR 22 18, endorsed typewritten "On Active Service", addressed to Toronto; scarce Canadian Siberia usage, tear at top, slightly reduced at left, attractive Very Fine appearance. Estimate  $200 - 300. $0 (Image)