regnal year 30 ist 556/557, so this coin was probably minted from 557/558 on.
Rarity: I´m no specialist for Justinian, so I can´t tell you , if it appears regularly on sales,
auctions,...
It seems to be
rare, but it´s no
rarity, counted in single pieces. Wolfgang
Hahn was the first and the last to count and look for numerical appearence. He must have found several specimens of this coin. But this tells us nothing about its current
rarity, for, in my experience, the
rarity of coins changes in political uneasy times like ours in very short intervals.
There is one speciemen offered on
vcoins since months. If it was an absolute
rarity, it wouldn´t last there for such a long time...
Best regards Posa