A late 18th century Swedish plaque ring, with the date 13 Augus 1793, in gold on blue guilloché enamel ground with white enamel border, the shank formed wth six 18 carat gold chains on a detachable clasp.
Swedish control marks to the reverse. 
 
size - 6.75  (N)  approximately (chain 47mm long)
face measures - 20mm x 10mm 
weighs - 6.4
swedish 1793
condition - excellent