A Stuart crystal, pearl and enamel memorial ribbon slide, second half 17th century, centred with

A Stuart crystal, pearl and enamel memorial ribbon slide, second half 17th century, centred with gold wirework initials on a plaited hair ground beneath rose cut rock crystal, within an outer border of pearls, surround of pearls, the reverse applied with black, white and pink enamel with a dedicatory inscription reading 'M.F Desember y.25 1655', length 2.6cm, pearls untested, case