SALT-SILVER, One penny paid at the feast day of St. Martin, by the tenants of some manors, as a commutation for the service of carying their lord's Salt from market to his larder. Paroch. Antiq. 496.
Source: The Law-Dictionary: explaining the rise, progress, and present state, of the English law (etc. etc.) Vol. VI. Giles Jacob & T.E. Tomlins, Printed for, and published by I. Riley, New-york; and by P. Byrne, Philadelphia. Fry and Kammerer, Printers. 1811