Bagster & Son, Richard & Jaspar (1806-11)
Bagster & Son, Richard & Jaspar, 20 Piccadilly, London, u and tentmakers (1806–11). [D] An R. Bagster, u and tentmaker, is recorded at 35 Piccadilly, 1809–11. [D]
The original entry from Dictionary of English Furniture Makers, 1660-1840 can be found at British History Online.