Bernhardt Burghardt Assmus (–unknown)"Police." The Times (London, England), Thursday, Jan 07, 1892; pg. 14; Issue 33528. was a German stamp forger operating in London. He was originally from Hamburg.
He was unmasked after Morris Giwelb bought forged Penny Black VR official stamps from him in August 1890."Morris Giwelb" by Cyril Permutt in Philatelic Paraphernalia, No. 23/24, April/July 1990, pp. 333-334.Birch, Brian. (2012) Biographies of Philatelists and Dealers . 12th edition. Standish, Wigan: Brian Birch, p. 880. Giwelb accompanied the police on a visit to Assmus' premises at 12 Church Street, Islington, and assisted them at Vine Street Police Station in sorting the seized material.
He was found guilty of fraud in 1892.London, England, Proceedings of the Old Bailey and Ordinary's Accounts Index, 1674-1913
References
Further reading Herst, H. (ed.) (1986) Forensic Philately (An Account of the Famous English Stamp Fraud Trials involving Messrs. Bluett, Benjamin, Sarpy, Jeffryes and Dr. Assmus Originally Published in "The Stamp News", 1890-1892). Lake Oswego, Oregon: Herman Herst Jr.