The letter A on the bezel of this ring was probably the initial of the ring's owner. Signet rings were, pressed into hot wax to seal a letter or packet. Personal seals (secreta) provided an essential legal safeguard and were used to witness documents such as wills, deeds of gift, loans and commercial documents, personal letters and land indentures. A letter from Lord Berengario in Verona in 906 underscores the importance of the signet: ‘So that this may be more truly believed and more faithfully observed, we order this to be sealed with our ring, confirming it with our own hand’.

Signet rings could be engraved with a coat of arms or crest, an initial, a merchant's mark (a geometric symbol used to mark goods or personal belongings), or a personal symbol. Sixteenth and seventeenth century portraits show signet rings worn on the forefinger or thumb, presumably to make it easy to apply the ring to the wax by turning the hand. They were items of jewellery with a practical function but the use of precious metals and engraved hardstones indicates that they were also signs of status. Rings were made from a range of materials - from precious metals such as gold and silver to cheaper brass and bronze which could be polished or gilded to look impressive.

This ring forms part of a collection of over 600 rings and engraved gems from the collection of Edmund Waterton (1830-81). Waterton was one of the foremost ring collectors of the nineteenth century and was the author of several articles on rings, a book on English devotion to the Virgin Mary and an unfinished catalogue of his collection (the manuscript is now the National Art Library). Waterton was noted for his extravagance and financial troubles caused him to place his collection in pawn with the London jeweller Robert Phillips. When he was unable to repay the loan, Phillips offered to sell the collection to the Museum and it was acquired in 1871. A small group of rings which Waterton had held back were acquired in 1899.

Edmund Waterton used the fortune which was made by his family’s involvement in the British Guiana sugar plantations to put his collection together. His grandfather owned a plantation known as Walton Hall and his father, Charles Waterton, went to Guiana as a young man to help run La Jalousie and Fellowship, plantations which belonged to his uncles. When slavery was abolished in the British territories, Charles Waterton claimed £16283 6s 7d in government compensation and was recorded as having 300 enslaved people on the Walton Hall estate.