This is a 3rd class advertisement mailing, as indicated by the 1-cent rate, and the ‘mute’ machine cancel.
The machine cancel had the month, day, and time removed, as appropriate for 3rd class usage, but still shows the year (1918). This is not specifically a war rate, as 3rd class rates were unchanged. However, it is an interesting patriotic imprint, which not only includes the wording ‘Support the President’, but also a rebus for ‘Rosenfeld’, who I assume was the sender and creator of this item.
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