A George III/IV condiment or crysmatory

A George III/IV condiment or crysmatory, of tubular form, unscrewing to form three separate compartments initialled 'I', 'B' and 'C' respectively. Makers mark only 'RC' (struck once) probably Scottish, possibly by Robert Clark, Edinburgh , last quarter of the 18th century, 4in (10cm) overall, 2oz.