We think this may be a decorative plaque rather than a gaming chip given the carving to one side only but we would place it around the same age as gaming counters with similiar designs. Some signs of age as detailed below.
Makers mark / hallmarks: Hand engraved with often similiar but unique engraving as pictured
Sourced: in England
Origin: Chinese
Age: circa 1800-1850’s
Materials: mother of pearl
Size roughly: 2.25 x 1.15 inch or 57 x 29 mm
Condition: in antique condition with signs of previous use, no chips or cracks but some natural imperfections in the mother of pearl are likely visible, very slight wear to edges, some yellowing to corners which may be natural discolouration, some dust / dirt caught in engraving, please see all pictures
Shipped from France