Could not find Gilkerson, but Neumann ("Swords and Blades of the American Revolution", 1973) #364.S, has a cutlass with this heavy type blade dating 1740-60 at 19"; there is no marking, but the wide blade with radiused hatchet type point is identified American/European.
#376.S is an English cutlass with similar heavy blade (26") and marked to ship The Thomas of Selby on both the sheet steel guard and blade (dated 1770-1800). It is noted these type blades seen on English cutlasses into early 1800s.
Perhaps this is a prototype for the 'figure 8'? The ribbed iron grips were used of course on customs and other civil service groups, but unsure if these would have had the crowned GR.
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