Hi,
I am afraid your readings won't hold. Both
monograms lack T. So for the
obv. a dative 'maththaio' would fit (spelled with two theta's and omega), but that would be a big stretch, as a
genitive is expected for this
type. I think your drawings are correct, and the reading 'Thoma' (
gen. of
Thomas) is far more likely. The
rev. solves elegantly into 'diakonou', so
Thomas, deacon.
Regards
Gert