Great Britain 1840 Mulready Letter Sheet Stereo A40 Maltese Cross Advertising

1840, 1d Mulready letter sheet, stereo A40, struck with Corn Hill handstamp in red, overstruck with black Maltese Cross, to Regents Park, with SP 9 arrival backstamp, contents "Printed for A. Cuddy by I. Page, Horseferry Road", with various advertisements including gunpowder sales, "Hill's Transparent Anti-Ophiasis", "Price & Co's Perfumery", "Bentley's Extract of Honey" hair tonic, Watts & Co "Foreign Wine Establishment", Crosswaite's Occult Lozenges for "Cure of Asthma, Coughs, Sore Throats", etc, usual filing folds, a fine example with scarce advertising contents.