Bank of England, B.G.Catterns, a group £1, ND (1930), prefixes H50, J78, K58, L06, M06, N07, O73, R46, S83, T33, U17, W67, X91, Y25, Z92, green, Britannia at top left, value at top right and low left(EPM B225), a complete group of every prefix issued for this series, about extremely fine to uncirculated (16).
Estimate: £600 - £800