Captain Marcus Rainsford Signature taken from here :A Memoir of Transactions that took place in St. Domingo in the Spring of 1799 (London, 1802; 2nd edit. as St. Domingo; or an Historical, Political, and Military Sketch of the Black Republic, 1802).
The Signature is signed at the end of this book here.
I photoshopped the image with a WHITE background and then removed all the yellow book covering to make it look more in line with all the other historical signatures on wikipedia.
https://warwick.ac.uk/fac/arts/history/students/modules/hi2a5/timetable/slaves/memoiroftoussaint.pdf
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