Possibilities exist... 1. the stamp is from a top right corner. 2. the stamp had a wing margin right side cut off/ the stamp is badly centered and had the top trimmed (it does show signs of being trimmed at the top).
As it is a single stamp there is no way of saying it could be "imperforate between" unfortunately. As far as I can tell from my book your stamp comes in three varieties of watermark depending on date if issue... cabled anchor, anchor (16mm) and anchor (18mm) with dates being 1862, 1864 and 1867.
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