Postby silvermakersmarks » Mon May 31, 2021 2:39 am
It is the 1837 "O" with TL for Thomas Lawrence. No problem with the duty mark as Birmingham didn't start using Victoria's head until 1840, 3 years after she came to the throne. The reason for the lateness was, as I understand it, that the duty mark was part of hallmarking law and when Parliament passed a new Act prescribing the change they only legislated for London, completely ignoring the provincial assay offices.
Phil