It appears to be perforation 12 vertical, dark green, but I'm confused by the apparent hand cut bottom margin and uneven top margin.
The non-perforated top and bottom appear to preclude the pane SC107 unless the bothm margins were printed much deeper than normal, allowing hand cutting of the horizonatl edges.
The non-perforated top appears to preclude any of the booklets (SC107b, SC107bi and SC107c) unless the bottom margin was printed much deeper than normal, allowing the hand cutting.
Not a coil as they are either perforation 8 vertical (SC128) or perforation 8 horizontal (SC133).
Not a part imperforate coil as they are perforation 8 vertical.
The absence of side perforations preclude the imperforate SC137.
It looks to me like a stamp with a natural straight edge on the top and trimmed perfs on the bottom. I can see hints of two perf holes under the "C" of "CENTS". Stamps with a straight edge on the top can come from both booklet panes and the later printings of the sheets of the Admiral series. The sheet stamps have slightly rougher straight edges than the booklet stamps, and your stamp shows this rougher edge along the top.
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