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I read somewhere that it was the practice to not have the soldier identify where in Siberia he was and what was he doing there...thus the hand stamp which only confirmed he had arrived safely.
Theo Van Dam's book "The Postal History of the AEF, 1917-1923" notes that the "The ship I sailed on has arrived safely overseas" cards were completed before sailing and left at the original port until a cable was received from the destination port, then the cards were mailed from the US port.
Thus the cards were not on the ship, nor ever left the US, so impossible for any soldier or sailor to say where they had arrived at, etc. The card in the OP appears to be similar.