Frodsham was a founding member, and later Vice President, of the British Horological Institute, and a Liveryman of the Worshipful Company of Clockmakers, in which he served as Master in 1855 and 1862.

His obituary stated that ‘during a long and honourable career, he distinguished himself by his devotion to the science of horology, which he greatly advanced, and his clever works upon the subject are regarded as authoritative by members of the trade.’[12] Charles’ son Harrison Mill Frodsham (1849–1922) took over the firm, following in his father's footsteps by publishing his own theoretical horological material, including an important series of articles entitled ‘Some materials for a Resume of Remontoires’.

[14] In the 2nd half of the nineteenth century, the firm provided sidereal regulators for new observatories being established worldwide, notably in Australia at Sydney and Melbourne; in Italy at Padua, Palermo and Naples; and in the US at Harvard and Lick.

09182 (now in the Lord Harris collection at Belmont),[15] with marks of 93.9, holds the record for the highest score ever achieved by an English watch tested at the Kew Observatory.

This cryptogram for the year Anno Domini 1850 is formed by the numerical sequence of the letters in ‘Frodsham’, with the addition of Z for zero, and was used from that date on by the firm to indicate first quality.

A new branch specializing in motor accessories was opened in nearby Dering Street in 1911, to sell speedometers and car clocks.

In 1997 the company moved to new retail premises at 32 Bury Street, St. James's, and set up a manufacturing and conservation workshop in East Sussex, where it continues today, specialising in English precision horology.