The business of Charles P. Brown and Charles P. Brown & Sons was still in existence at at least 1920:
Notice is hereby given, that the Partnership heretofore subsisting between us, the undersigned, Charles Brown, Arthur Brown and Sidney
George Brown, carrying on business as Silversmiths and Manufacturers and Importers of Fancy Leather Goods, at 6, 8 and 10, New Charles-street, Goswell-road, London, E.C. 1, under the style or firm of "CHARLES P. BROWN " and "CHARLES P. BROWN AND SONS," has been dissolved by mutual
consent as from the eighth day of May, 1920. All debts due and owing to or by the said late firm will be received or paid by the said Charles Brown and Arthur Brown; and such business will be carried on in the future by the said Charles Brown and Arthur Brown, under the style or firm of " Charles P. Brown " and " Charles P. Brown & Sons."—As witness our hands this 13th day of May, 1920.
S. G. BROWN.
Source: The London Gazette - 18th May 1920