An enamelled brooch showing a royal crown over a monogram unmarked, circa 1900.
Price:

In Chaucer's Canterbury Tales, the Prioress is noted as wearing a brooch with a crowned emblem. Commenting on the passage, Phyllis Hodgson (1969) notes that  for a nun to wear a brooch was worldly vanity but that "customarily such an emblem combined M and A in a monogram standing for 'Maria', surmounted by a crown to designate [her as] the Queen of Heaven". The design has also been noted as pertaining to Mary, Queen of Scots.

A Queen Victoria Jubilee brooch with V, rose, thistle and shamrock in a garter surmounted by a Royal Crown; unmarked, inscribed THE QUEEN'S JUBILEE 1886/7 (sic), also with Registration mark on reverse 'Rd 27426'.
Price: £145.00

[Queen Victoria inherited the throne on the death of her Uncle, William IV on 20th June 1837. However, due to the conflict between the historical and civil calendars, her reign was deemed legally to have started on 20th June 1836 — so, for example, "The Jubilee Date Book" (published 1887) records Victoria's Jubilee year as "20th June 1886 to 19th June 1887"]