ClipArt ETC
"The surrounding of the punchmark with a band bearing a name, and the introduction of a head in its center, gradually led to the perfect reverse. There is a remarkable series of so-called 'encased' coins struck in Magna Graecia, of which the reverse is an exact repition in concave of the relief of the obverse." — Chambers, 1881

Encased Coin

"The surrounding of the punchmark with a band bearing a name, and the introduction of a head in its…