Help in identifying maker

I took a chance and purchased this 3-piece set on eBay. I was alerted by the craftsmanship of the goldwork, the deep saucer, the twisted/intertwined handle, the finial, and the cartouche/medallion on the cup. The seller could not decipher the mark on either cup or saucer, nor can I, since they are smeared or blurred, and I realize that as a result I may never know for sure who the maker is…but I am guessing the set is English, based on the gold design and motifs and a little research on military uniforms of the late 1700s and early 1800s. I wonder if it’s a syllabub cup. I would like thoughts as to maker and age.

Saucer: 5 ½” diameter, 1 ¼” high, has well for cup
Cup: 3 5/8” tall, 3 ¼” diameter, tapers toward bottom. Twisted gold handle. Inside edge totally worn away (probably was gold design) to depth of 5/16”.
Cup with lid to top of finial: 5 ½” tall. Finial is a gold knob with 3 gold leaves and stem.
Glossy glaze.
One unusual motif I have never seen before: chain links, designed to look like swags.
Oak leaves (symbol of England) predominate in the gold motifs.
Several firing flaws and small pits; surface of cup feels slightly uneven where gold bands are.
Heavy weight, solid pieces despite delicacy of goldwork. Only 1 hairline crack, in lid underside, does not show through. Gold loss throughout, though handle or finial gold isn’t worn.

Cartouche on cup: Man’s face with wild hair (or a helmet with feathers; possibly British or American dragoon, used by horsemen in Revolutionary War and War of 1812). He holds a thin flagpole with an unidentifiable flag. Also pictured is a shield (not used in either war), a drum below the shield, a trumpet, a sword (double guards, not the type used by horsemen), and two “tubes” (fifes? batons? gun barrels?). All surrounded by laurel leaves and sprigs. A commemorative set for Napoleonic Wars, Revolutionary War, War of 1812? But: if a commemoration for the latter two, why would a British maker celebrate these, since the British lost these wars?

Mark: in red under the glaze, on both cup and saucer, in an irregular circular pattern, arranged around a blank center. The closest I can come to a mark with a blank center (from looking at hundreds) is Coalbrookdale, 1805-1810.