Oh, that's a nice one! Good introduction to Blades, East & Blades, who I'd never heard of. Beautiful design.
A steam printer formed in 1840 when William Blades apprenticed with his father in London. The firm produced notes for British North Borneo, Leeds Old Bank, and serial numbers for the first 1 Pound notes for the United Kingdom after WWI.Here's the only test note attributed for the firm.