32 & 33, Hamsell Street, Aldersgate Street, later, 38, Finsbury Square, and 15 & 16, Featherstone Street, London

Oppenheimer Pipes Ltd. - London - 1935
Established in 1860.
The firm entered their marks, 'AO' (Adolphe Oppenheimer), with the London Assay Office.
Not to be confused with the firm of Oppenheimer, Seckel & Co., who were also pipe manufacturers.
Trev.