A cased 19th century silver mounted fob seal

A cased 19th century silver mounted fob seal, with interchangeable purple paste matrixes which read 'I respond to every touch', 'For further particulars enquire within', 'Such is life', 'The eyes or all the heart or one', 'Fidelity', 'A letter soothes the pains of absence'. In original case with compartments for the individual seals.