A rosewood 2-day marine chronometer, No. 6507, George Edward Frodsham, London, circa 1875

3¾-inch silvered dial signed G E Frodsham, 31 Gracechurch St, London, 6507, subsidiary seconds and up/down dials, fusee and chain movement with Earnshaw's detent escapement, compensation balance with free-sprung helical spring, well spotted plates, the brass bowl gimballed in a three-tier brass-bound case with side handles, the front with ivory plaque signed G E Frodsham, 31 Gracechurch Street, London and an ivory roundel numbered 6507; together with a Certificate of Discharge for Alfred Gasston, 7th June 1881

No. 6507 is listed in 'Chronometer Makers of the World" by Tony Mercer as having been used on the Britannia, a grain ship out of Shoreham, Sussex.  The barque Britannia was launched at Shoreham in 1877 and, under her Master and part-owner Captain Alfred Gasston, she sailed around the world carrying a variety of cargo. In September 1883 she was sailing between Jamaica and Montreal when she struck a sand bar and was wrecked with the loss of thirteen lives including those of Gasston's wife and his two youngest children.  Alfred Gasston survived the disaster and returned to Shoreham and his other children.  He died in 1920 aged 86.