We believe this mark refers to the silver and jewellery manufacturers, Henry Griffith & Sons, established in 1850 by Henry Griffith (born 1825).  

He registered his first hallmark with the Birmingham Assay Office in 1858.  The firm was listed and recorded between 1885 and 1947 as manufacturers of gold and gem bracelets, brooches, earrings, rings, tiaras, necklaces, lockets, pendants as well as signet rings, studs, cufflinks, cigarette cases, watch bands, gold and silver pencil cases, thimbles and serviette rings.  Also, one-off pieces such as mayoral chains of office and presentation caskets.  
Henry Griffith had worked with his father, who was a specialist thimble maker, from the age of 7 and he put his father in charge of this department when he set up the business in 1850. Their premises were on Warstone Lane, Birmingham, initially at 161 and later at 149 and finally 131 in 1903.  

Henry was joined in partnership by his son, John Henry Griffith, his son-in-law, Edward Sermon, and another son Frederic Griffith, trading as Henry Griffith & Son, then Henry Griffiths & Sons up to 1898.  The partnership with Edward Sermon was dissolved in 1881.  During this period, the firm registered hallmarks at the Chester and London Assay offices.  

When Henry retired in 1898, the firm became a limited company, Henry Griffith & Sons Limited, run by his son Frederic.  The firm went into liquidation so that John Henry Griffith could retire in 1912 and reverted to Henry Griffith & Sons trading in Birmingham until 1919/1920 when they moved into a new purpose-built factory in Tachbrook Road, Royal Leamington Spa, taking advantage of special concessions offered by the Leamington Spa Borough councils to encourage firms to come to the town after the First World War. During the Second World War, it is believed that delicate aircraft instruments were assembled in the factory.  It ceased to be a family business in the 1950s being taken over by Caledonian Holdings Ltd and the business was gradually run down in the 1970s from a workforce of 350 to around 50 when it eventually closed in 1982.

Henry Griffith lived at Field House, Church Lane, Handsworth, Birmingham from 1873 until his death aged 91, in 1916.  A later family member, W. Harold Griffith, Secretary of H. Griffith & Sons Ltd, lived at Knavenhill, Leamington Spa in the early 1900s.