Now I have a wee bit more time I can explain that the item I found and could not post publicly for copyright reasons was an official notice of the company from the Pall Mall Gazette archives. The following facts have been extracted from the notice:
The company was formed as a partnership in 1828 as Berens, Blumberg & Co. It later became Blumberg and Company, still a partnership. Three addresses given were: 2 Cannon Street, St Paul's EC; 16 Old Change, EC; 64 Rue de Bondy, Paris.
The business was exclusively wholesale, with c. 10,000 customers worldwide, and described themselves as manufacturers and importers. It was said to be an extremely sound and profitable concern with the percentage of profits described as "unusually good."
The Pall Mall Gazette notice was dated 26 July 1883 and advertised both that the business would become a company (i.e. limited) and that a share issue would raise new capital for the business; an action necessary after monies had been withdrawn from the business on the deaths of various partners and the retirements of others from the business.
Two Blumberg's were to have a place on the board of directors once the company was established: Charles Nathaniel Blumberg and Victor Ludwig Alexander Blumberg, both of whom were part of the pre-limited company business management. The other three directors were the following fellow businessmen:
Joseph C Wakefield, Esq., (Messrs Inglis and Wakefield), London, Manchester & Glasgow. [Chairman]
Frederick T Issitt, Esq., (Messrs J & C Boyd and Co.), London EC.
Robert Spence Esq., (Messrs Baggallay's and Spence), London EC.
It's sad to note that just three years later, in 1886 the limited company was subject to a winding up petition instigated by a creditor, and that the company was finally struck off the Register in 1892 (both reference the London Gazette). Obviously something had gone badly wrong in those three years since becoming a limited company.