The majority of the
Byzantine collectors nowadays, use Sear
catalogue in order to achieve a fast
identification of a coin.
Of course not all scholars always agree with the IDs given on the
catalogue.
The coin under examination is for sure the one we call "Sear 282".
CNG has placed a question mark on Iustinus II name because scholars seem to reconsider which is the emperor.
Hahn in
his new work
MIBEC, calls this coin as "formerly attributed to Iustinianus" and now he assigns it to Iustinus II based on a few similarities he noticed between the A and stars of this coin and some other Iustinus II coins.
According to the above, you chose the emperor

PS
Lately some good
quality specimens have come to light which made it clear that the letter on the
reverse is not

but some form of

as it is pictured on the lovely
CNG specimen.
tk