CONCORDIA AVGG (397 / 402)

Bust of Theodosius II facing, cuirassed, wearing a helmet with crest and a pearl diadem. Holding a spear passing behind his head with the right hand and a decorated shield with a horseman slaying an enemy, with the left hand.

Constantinopolis seated on a throne with her head to the right, holding a scepter with her right hand and a globe surmounted by a victory with her left hand. Her right foot placed on a prow.

Photo of a coin sold the 25/06/2014 by Classical Numismatic Group, Electronic Auction 329, lot 578, link to the sale: https://www.acsearch.info/search.html?id=3308829, link to their website: https://www.cngcoins.com/. 

The book ''Catalogus Numismaticus Musei Lefroyani (1763)'', page 25, describes a similar starless coin with Z mark but the ship's prow is not mentioned in the description: ''Roma sedens galeata in sella, dextra hastam, sinistra globum cum victoria, in ima parte CONOB''. The description reversing the position of the held objects is normal because it describes from the point of view of Constantinople and not ours. A similar coin with the S mark is referenced in the Tanini page 308: ''Mulier sedens, d. hastam, s globum cun victoriola, pede dextro prorae navis imposito ; in exergo CONOB. Solidus''. This describes a seated woman with a spear on the right, globe on which rests a victory on the left. The right foot placed on a ship's prow. The star is not mentioned but it may be an oversight, same remark concerning the inversion of objects. If we have only one coin known coin showing this reverse without star with the mark S but whose officina has been modified to letter G (AYC #7 Tr off, RIC 9), there is indeed a coin with the mark Z, it is this AYC #7a, RIC 9.

This series is characterized by a small bust. As for Zeno, we notice a finer portrait of the first years (397 / 402), while the portraits of the following series will become wider and Theodosius II will look more to the right even if mixtures exist from 402.

The legend seems to show two letters DD: DD N THEODO - SIVS P F AVG. In reality this first letter D is an element of the drawing as we can see here but positioned higher: 

Photo of a coin sold the 25/06/2014 by Classical Numismatic Group, Electronic Auction 329, lot 580, link to the sale: https://www.acsearch.info/search.html?id=3308829, link to their website: https://www.cngcoins.com/.