The older of the two firms was that of Joseph Hart & Son. Hart had started in business c.1840 and in 1853 he took on a young man from Devon, Thomas Peard. Peard left the employ of Hart in 1860 to start on his own account, but was soon joined by Frederick Jackson and the new firm was known as Peard & Jackson. In 1866-7 the two firms united under the banner of Hart, Son, Peard & Co.. By this time Joseph Hart appears to have retired and his son Charles taken over his role. The new firm opened a factory in Birmingham, the Grosvenor Works, that was supervised by Charles Hart. Thomas Peard ran the London side of the business and Frederick Jackson the firms finances.
All three businesses entered marks with the London Assay Office and the new firm entered marks at Birmingham also.

Hart, Son, Peard & Co. - London - 1883
Trev.