This is a very rare form of a brass trumpet stick with a ball knop. The design is more prevalent in contemporaneous pewter sticks. For additional information and a related example see Christopher Bangs, The Lear Collection: A Study of Copper-Alloy Socket Candlesticks, A.D. 200-1700. (Bethlehem, PA: Oaks Printing Company, 1995), pp. 142, 320, no. 115.