One Beautiful Page of Early 19th Century Hand-marbled Paper (Ledger Cover)

Found digging through a bin of papers at a shop in Nashville, and too lovely and scarce not to grab. Despite the more recent handwritten note on the reverse, I believe this was not an end paper but rather the front or back cover of an early-mid 19th century ledger, probably from a mensuration notebook filled with beautiful headers and calculations! Hand-marbled, rich color, heavyweight paper, gorgeous.  8 3/4 x 10 1/2. Wear and a bit of loss around the edges.