IMP XXXXII COS XVII P P (type I, B) (441 / 450)

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.. 

Constantinople seated left on a throne, holding a spear with the left hand and a globe surmounted by a cross with the right hand. A shield behind the throne and a star in the field to the left.

Photo of a coin sold the 28/12/2022 by Heritage Auctions, Auction 232252, lot 65313, link to the sale: https://www.acsearch.info/search.html?id=10369596, link to their website: https://coins.ha.com/itm/1/1/1/a/232252-65313.s?type=acsearch232252#. Coin under shield NGC, link to their website: https://www.ngccoin.com/certlookup/5230694-018/NGCAncients/.

Mark CONOB.

Type I: with mark CONOB or COMOB (CONOB here) and the reverse legend usually ending before the shield. No punctuation on legend on either side. A square throne, the right leg as a triangular protuberance, stiff drapery and vertical scepter. This corresponds to type III of RIC X. Var B is the same as RIC X: smaller and rounder shield.

See AYC #21, RIC 323: https://www.all-your-coins.com/en/archives-anciennes/romaines-imperiales/imp-xxxxii-cos-xvii-p-p-type-i-a-441-450, for the commentary explaining the entire coinage.