I cant find this particular one in wildwinds

Was wondering if I could get some help attributing this one.
It is a Maximianus Antoninianus and is something like RIC V 622 but I do not see it listed with the Δ in lower centre. Can anyone help ?

 

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RIC 622 seems correct.

Yours is the last mintmark listed, "A to EΔ". That means "officinae 1-9", so including your Δ=4.

 

Edited to reflect the fact that I was too late:
That span covers your coin, my Z (officina 7) and 17 other minor variations.

That is just the way RIC works.

 

Thank you @curtislclay and @dougsmit for the help very appreciated !

 

Wonder if putting this one in some distilled water would help get rid of some of the dirt on it ?