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Imperial Russian Postal History by Theme - Military Mailings - FIELD POST ON MANOEUVRES: 1902, stationery envelope 7k blue, bearing two different boxed three-line markings ''Field Post on Manoeuvres. Main Field Post Office'' on reverse in violet and very slight on front in red, posted from St. Petersburg to St. Michel (then Russian Finland), postmarked on arrival, VF, Standard # MK41B