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 on 19 January 2005 by Classical Numismatic Group, Electronic Auction 106, lot 276, link to the sale: https://www.acsearch.info/search.html?id=208480, link to their website: https://www.cngcoins.com/. Coin resold on 18 September 2013 by Classical Numismatic Group, Auction 94, lot 1112, link to the sale: https://www.acsearch.info/search.html?id=1683378.

Variant with the letter M of IMP appearing to be a modified N. An additional stroke is seen superimposed on the right leg of the letter. This number needs confirmation. This single example is most likely a coin with the word IMP inscribed normally; the zoom of the photo is too small. The letter M is almost certainly engraved like most of the other letters M in the series, with the two middle legs crossing very close to the last leg on the right. In case of doubt, I'm adding this number: AYC #22 var corr, RIC 324.

Mark CONOB.

Type I: with mark CONOB or COMOB (CONOB here) and the reverse legend usually ending before the shield. No punctuation on legend 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 A is the same as RIC X: elongated and long 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.