A GENEROUS BEAST The Black Bull of Clarence descends to Queen Elizabeth II via Edward IV. But this beast actually appears before then with Lionel of Antwerp; son to Edward III, 1st Duke of Clarence, and ancestor to the Yorkist Kings.
The Black Bull was originally a supporter for the House Of Clarence. And while Edward and Richard were both descendants of the 1st Duke, they also held York lineage. So it seems Edward adopted the Black Bull, while his brother Richard opted instead for the White Boar of York as his personal badge.
It represents bravery and generosity, while the horns display strength and fortitude. Interestingly, they are four traits that seem more befitting to Queen Elizabeth II, than they did to Edward IV.
Your solid silver Black Bull is a beautiful beast as he stands holding the Shield of Arms used by all Sovereigns of the Houses of Lancaster and Tudor.