Constantine II GLORIA EXERCITVS mint help needed

From a bulk lot; worn and thickly patinated. I'm sure there are no dots in the field and no dots or stars preceding the mint mark in the exergue. Exergue may be SMNΔ, SMHΔ or SMKΔ, it's hard to say. I'm thinking Nicomedia because that third letter looks more like an N than anything else. However, I'm hoping that someone very familiar with this issue will be able to tell from the style which mint this is from. @Valentinian @Victor_Clark ?


Constantine II Caesar, AD 317-337.
Roman billon reduced centenionalis, 2.84 g, 17.3 mm, 6 h.
Uncertain mint, AD 330-335.
Obv: CONSTANTINVS IVN NOB C, laureate draped and cuirassed bust, right.
Rev: GLOR-IA EXERC-ITVS, two soldiers standing facing each other, each resting on spear and shield, two standards between them, mint mark SM?Δ in exergue.

Thanks in advance and feel free to post anything you feel is relevant!

 

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Not sure if this will help much, but here's the exergue photographed under different lighting conditions.

 

Same legends, but half the weight and only 1 standard between the soldiers:

 

My guess would be SMNA or SMNdelta. I also found the banners rather pointed - something Dane Kurt (Helvetica) also points out, but that seems to be limited to Trier and Lyon, both possibilities very unlikely.

Frans

 

Just my impression when looking at the letter blob, without any research... I see an “N.” SMND