BITHYNIA. Calchedon. Gordian III, 238-244. Tetrassarion (Bronze, 29 mm, 11.68 g, 12 h). Μ ΑΝΤ ΓΟΡΔΙΑΝΟϹ ΑΥΓ Radiate, draped and cuirassed bust of Gordian III to right, seen from behind. Rev. ΚΑΛΧAΔΟΝΙΩΝ Apollo seated right, resting his right hand on column and holding lyre set on his knee with his left. RG 110. RPC VII.2 online 1848. SNG von Aulock 500-1. Rare and with a beautiful rendering of Apollo. Somewhat smoothed, otherwise, good very fine.