Have looked at this
weight off and on for a
bit and have not found anything similar so here are some thoughts.
Would guess it likely to be a
roman trade/Spherical commercial
weights which were a common
type,
weight wise it does not match being a ounce > 26-28<g,
nor half ounce of course. It fits interestingly in the range to be considered a 3/4 ounce
weight of 25.25g.
Not sure of the iconography.
CW