It is a type I Scott 453 with a single line watermark. The lower hari of the upward curving pair to the right of Washington's ear is much shorter, a type I indicator (area 9 in the second 1847usa link below). A Scott 491 would be a type II without a watermark. The color would be slightly duller and darker and the paper would be somewhat darker and more fibrous. Almost all type II rotary coils are the watermarked Scott 454.
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