Hi Adam,
Although there is no doubt that it is a (nice) Selkirk weight, and may even have been designed by Peter Holmes. It is unlikely to have been made by Peter himself as it does not seem to have his signature cane (PH) anywhere. Although that is not full proof as I own a limited edition Selkirk weight without a PH cane but which states 'Made by Peter Holmes' with Peter's signature!!!.
SophieB