You are correct the spritsail topsail use came to an end on English ships of war in the early part of the 18th century.I however have a suspicion that at the time they introduced the dolphin striker with its martingale lines the spritsail topsail idea was abolished,
The dolphin striker had six variations between 1794 and 1840. In all cases the striker was square or rectangular, according to Jame Lees in The Masting and Rigging English Ships of War, The number of holes, and later, slots with sheaves, varied from 1 to 5 depending on the year. And then throw in the variations we see in virtually every ship, era, nation, none of this may be correct for Victory.
Allan



