Adding on a few more silver pieces to complement @voulgaroktonou's wonderful assemblage.
Heraclius is known for introducing the abundant silver hexagram coinage in the East in response to war with the Sassanids. But in parallel, he also continued the tradition, going back to the time of Maurice, of producing a much smaller issue of "ceremonial miliaresia" with obverse types and legends mirroring the gold series. The "ceremonial" purpose these served remains unclear -- likely they were some sort of imperial donative -- but one presumes beauty took a backseat to function. I give you the flounder emperor:
Heraclius, 610-641. "Ceremonial" Miliaresion (AR, 22mm, 3.69 g, 6h), Constantinople, 610-613. dN hERACL [IUS PP AVC]. Diademed and draped bust of Heraclius right / Cross potent on base and two steps between palms. DOC 55, MIB 128, Sear 788.
And now a new pickup from CNG that arrived this week. In the West, the pattern of silver issues was stable relative to the preceding centuries, with the exception of the Ravennate hexagram @voulgaroktonou shared. (Though in DOC, Grierson suggests that attribution is uncertain and posits Thessalonica as an alternative.) Small silver coins continued to be issued at Ravenna and Carthage, with surviving examples from the latter weighing significantly more than from the former. The piece from Carthage below comes from a relatively common issue that likely began with Martina's coronation in 614.
Heraclius, with Martina and Heraclius Constantine. 610-641. AR Half siliqua? (10mm, 0.60 g, 9h). Carthage mint. Struck 614-641. Crowned, draped, and cuirassed bust of Heraclius facing, beardless / Facing busts of Heraclius Constantine (left) and Martina (right), the former wearing crown and chlamys, the latter wearing crown, long pendilia, and robes; cross above. DOC 233, MIB 149, Sear 871.
Thanks for indulging my first post on this forum that (hopefully) slipped in right before the deadline. I feel lucky to have found this community with so many passionate Byzantine students/collectors, and have learned so much already!