Printed on thin card this is a vintage copy of a photograph by W. Heath & Co., Plymouth. It is signed by ‘Edward Clarke’, who was a Victorian barrister and Conservative politician born in 1841. He took part in a number of famous legal case, representing Oscar Wilde in 1895 and (in a separate case) cross-examining the Prince of Wales in 1891. He was knighted in 1886 and lived into his 90th year.
Several other portraits of Sir Edward Clarke can be found on the National Portrait Gallery website.