This is
Sear 810 with Heraclian
Monogram 25 over the M (listed in
MIBE as 164c). This variety is known for RY 23, 24, and 25. Your coin looks like RY 23 or 24. The typical date arrangement would be X / X / II / I(I). You can clearly see the first X, space for the second X (with a delta in the way), the II after where the second X should be, and the last I (RY 23) or II (RY 24) to the right of
exergue line. The extra design elements you see are from an earlier strike.
As is typical with Herclian bronzes, this coin was struck over an earlier
type. The delta you see where the second X belongs is from an earlier
type - perhaps the
officina mark. One clear sign of this is there are also remnants of the earlier
type on the opposite
side of that same place on the
planchet - to the right of Heralius
Constantine (where you have identified odd marks in yellow).