The solidus was maintained essentially unaltered in weight, dimensions and purity until the 10th century.
The word soldier is ultimately derived from solidus, referring to the solidi with which soldiers were paid.

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Reverse: VICTORIA AЧGЧ Z, cross potent on three steps; at sides, Heraclius and Tiberius standing facing, each holding globus cruciger; CONOB in exergue.
Die Orientation: 7 H
Weight: 4.38 g

Reverse: GNO LЄON PAMЧ Crowned facing bust of Leo III, wearing loros and holding cross in his right hand
Die Orientation: 6 H
Weight: 3.8 g

Reverse: C LЄON P A MЧL - Crowned facing bust of Leo III, wearing loros and holding cross potent.
Die Orientation: 6 H
Weight: 4.42 g
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Reverse: VICTORI - A AVGGG ? (officina 4) around, CONOB in exergue, Constantinipolis seated facing, head r., holding spear and cross on globe.
Die Orientation: -
Weight: 4.31 g
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Reverse: VICTORIA AVGGI, Angel standing facing, holding long P-headed cross, and cross on globe; CONOB in exergue
Die Orientation: 6 H
Weight: 4.24 g
The I at the end denotes the 10th officina.
Given that Theodosius was not raised as co-emperor until 590, it makes sense to date the coin to his reign in my opinion.
CONOB="Constantinople, 1/72 pound pure gold"