In further examination of the above pictured Cut Square, I see it is a U16a/U7 since the Label is short, the design color is like that depicted in Scott Specialized 2025 U8, pale green, and the paper is laid buff;
At 1st I thought I saw a break in the separation of the lines of laid paper and thought I had a "Laid Batonne", which would have been very weird, but as you can see in the photo below, the paper is "Laid" w/vertical lines.

A lot of this series was reprinted, but U16 was not included.
Have a GREAT day!!!!