Email from Jenny Swidells from the British Button Society.

From Rex:
This is a railway button, the initials
representing "Cheshire Lines Committee". In 1867, a number of smaller lines were taken over by a joint committee of three larger railways, the Manchester, Sheffield & Lincolnshire Railway, the Great Northern Railway, and the Midland Railway. The committee retained its identity under these three companies, and their successors, until nationalisation of the railways in 1948.

This pattern button was worn by the majority of the CLC's uniformed staff, senior uniformed staff wearing buttons of a different design.