Stone weight with an inscription (32202)

Found near a cippus boundary stone on the bank of the river Tiber.
Karivieri: "On top, on one side, are inscribed letters EXACTA ART, at center X, and on the other side, faintly IV P and other illegible letters (CAST?). An X at the centre indicates the weight - it translates into 10 librae (decussis = 10 × 329 gr), adding up to a total of 3,290 grams. The text exacta (ad) Art(iculeianam normam or -iculeanum) indicates that the weight has been calibrated according to a standard weight decree issued by Articuleius. If the other set of letters can be read CAST this could refer to ad Castorum (aedes), a place where standard measures were kept in Rome".

Photo: Karivieri 2020, cat. nr. 13.