INDIA 1856 SG45b Used 4a black error imperforate '1' numeral of Bombay

1856-64 4a black, no wmk, ERROR IMPERFORATE, very large even margins with trace of left sheet margin at SW corner, neatly cancelled by '1' numeral as type 4 but with outline figure (as Renouf type 4j), presumably at Bombay. Fine and very rare. (Pair cat £10,000). - P267001793