BBA

Not sure I have anything to compete with that Maximianus abdication issue. A beautiful piece. I do have one more interesting Constantine coin that I put away many years ago.

Constantine I Ae Nummus : London mint (22.4mm, 4.3gms)

Obv: CONSTANTINVS P F AVG: Laureate and cuirassed bust right

Rev: PRINCIPI IVVENTVTIS; Constantine standing facing in military dress holding standard in each hand; star in right field, PLN in exergue

Ref: RIC 215

Constantine I Ae Nummus : London mint, 19.9mm, 2.9gms 

Obv: CONSTANTINVS P AVG; Laureate and cuirassed bust right

Rev: CLARITAS REIPVBLICAE; Sol standing left holding globe and raising right hand, S – P across fields; PLN in exergue

Ref: RIC 102

Here's a monogram (not mine) that kind of looks similar ... again maybe

Here's the reverse shown upside down. Kind of interesting ... maybe.

Hey Orange Julius, try turning the reverse upside down.

It's ugly, but ...

Domitius Domitianus. Usurper, (296-297 AD); Ae Follis

Obv: IMP CL DOMITIVS DOMITIANVS AVG; Laureate bust right

Rev: GENIO POPV-LI ROMANI; Genius standing facing, head left, holding patera over eagle at feet to left, and cornucopiae

Ref: RIC 20

9 hours ago, Orange Julius said:

So! Who dis nummus?!

Pretty sure it's a Marcian monogram type. It's not a "K" at the right but an "R" (you can kinda see the upper loop)

4 hours ago, Severus Alexander said:

Here's a Carthage coin produced by the Vandals just before the conquest, probably under Hilderic

That's a nice example and better than most I've come across!

I obviously look for unusual coins and the early Byzantine "cross above bust" types definitely are that. Here's one of Justin I

Nice examples all! Very impressive.

Here's a lowly one but it's the bull and eagle type.

58 minutes ago, Severus Alexander said:

Great coin!!  It seems to be a very scarce type... do you know the date of issue?  is it from immediately following the reconquest?  I have a Carthage pentanummium that is somewhat similar, though much more common and without the awesome chi-rho on his breast.  I think Justinian looks cute on these:

I found the coin at a show probably 20 years ago, and it's still the only one I've ever seen (and I collect Justinian coins so I'm always looking at auctions). Can't determine when it was struck as it's not a dated issue. There's also a follis with the chi-rho on the breast which is also tough but slightly more common than this one. Note that Justinian struck a whole lot of coins and many are nearly impossible to find, even when Sear Byzantine implies they are somewhat common when looking at their assigned dollar value. BTW, it's kind of weird the authors decided to assign a dollar value to coins instead of a rarity designation.

My personal favorite Justinian type (and probably the favorite coin of my entire collection):

Justinian Ae Decanummium, Carthage mint (18.mm, 3.5gms)

Obv: Bust of Justinian right with Christogram on breast

Rev: Large I between two stars, cross above; KART in exergue

I've always liked the Constantine era campgates. Here's my favorite one of Crispus:

Obv: CRISPVS NOB CAES; Laureate bust right

Rev: VIRTVS AVGG; Closed-door campgate, P - R across fields; RQ in exergue

Ref: RIC VIII Rome 180

Some of the more interesting provincial types of this period were struck in Hierapolis Phrygia. Here's one of Valerian I and is a "homonoia" issue with Ephesos.