Here is a coin that just sold. It has an engraved shield that is probably a Victory presenting a wreath to Crispus (?) with soldier (?) beside him.
It is shield #10 (S 10) in Alten & Zschucke's Die romische Munzserie Beata Tranquillitas
Crispus. Caesar, AD 316-326. Æ Follis (19mm, 3.78 g, 12h). Treveri (Trier) mint, 1st officina. Struck AD 322-323. Laureate and cuirassed bust left, holding spear over right shoulder and shield / Globe set on altar inscribed VO/TIS/XX in three lines; three stars above; •PTR•. RIC VII 372. Dark green to black patina with some minor verdigris. Good VF. Rare and interesting shield type.
Ex Classical Numismatic Group 60 (22 May 2002), lot 1910.