Charles, AKA “Peakangus” in the forum, sent me these photos of a Rococo chair that he owns that is possibly a Belter piece. A few characteristics that when combined point to it being by JH Belter:
Hollow brass casters
Laminated construction
Rosewood composition
Pierced-carved back
Spiral terminated feet in a style seen on Belter pieces
Applied crest
Any of these [...]