Could be an experimental attempt by the mint at a silver wash.
Silver could have been in short supply at this time, when the need to issue a greater volume of coinage was needed.
By the time of Gallienus 8 - 10 years later, the silver wash had become very feeble, or even non existant.
Silver could have been in short supply at this time, when the need to issue a greater volume of coinage was needed.
By the time of Gallienus 8 - 10 years later, the silver wash had become very feeble, or even non existant.























