Need some help with the identification of these two coins

I usually try my best to research unknown coins myself as I get some joy in going through catalogs, research papers, journals, and history books, but these two have stumped me. I bought both of them knowing that the attribution given didn't seem to match the coin as I looked them up. Any help is much appreciated. Attached is the original attribution and pictures:

Justinian I (527-565) AE Denarius, Rome
8mm., 1,60g.

Obv: Justinian monogram
Rev: Diademed, draped, and cuirassed bust right.

DOC 372 (Uncertain mint; nummus); Morello 19/1 (Ravenna[?]; 2½ nummi); MIBE 94; SB 340 (Uncertain mint; nummus); BMC Vandals 140 (Vandalic).




Uncertain Emperor (Justin I or Justinian I ?), (circa AD 500-600). Uncertain mint
Pentanummium Æ

12mm., 2,30g.

Obv: Pearl diademed, draped and cuirassed bust right
Rev: Large epsilon, star and date

 

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The 2nd looks like a Pentanummium overstruck on a Roman votive of 30 years.

 

The second one is interesting, if it's a regnal year, I don't ever remember seeing that on a pentanummium. If it's overstruck on a little votive coin that's supper cool.

 

I suspected that the pentanummium was overstruck, but I couldn't put my finger on the host coin. The votive was exactly what I was looking for. Thanks. I knew that coin was special when I bought it