IMP XXXXII COS XVII P P (type I, A) (441 / 450) Comitatus mint

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.

Coin sold the 28/11/1975 by Franck Sternberg, lot 532 (note from catalog: ''Aus Auktion Leu 2 (1972), 468''.). This is the coin given as the source of RIC X 321 (the coin illustrated in the RIC X for number 321 is type B and another coin without a given source. 

Type I: with mark COMOB and the reverse legend usually ending before the shield with 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.