H. A. Byworth and Co
of 19 and 21 Heddon Street, Regent Street, London, W1. (1922)
Ditto Address. Telephone: Regent 5248 and 6591. Cables: "Gemmaceous, London". (1947)
- 1922 Listed Exhibitor - British Industries Fair. Finest Quality Gem-set Diamond, Sapphire, Emerald, Ruby, and Pearl Rings, Brooches, Necklaces, Bracelets, Earrings, etc., made to original and exclusive designs. (Stand Nos. E.22 and E.29) [1]
- 1947 Listed Exhibitor - British Industries Fair. Manufacturers of Fine Jewellery and Dealers in Precious Stones. (Olympia, Ground Floor, Stand No. E.1714) [2]