David
I've had a look at the details for Pitt & Co. The company was founded at 50, St. Martins Lane, London WC in 1875. It moved to 31, Maddox Street, London W in 1895.
The button on the left and the one in the centre were made after 1895 when the company moved to Maddox Street. The same backmark was used until 1973 when the company was bought by JR Gaunt.
The button on the right is older and was made between 1875-1894 when the company was based at St. Martins Lane.
Pete
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