These
monograms will be hard to solve, as they leave room to many possibilities (X/N/M or all those letters). The
obverse is possibly 'Chartoulariou'
monogram, can't make much of the second one. If the reading of the first one is correct, that would have to be a personal name, possibly combined with a
patronym.
The two
monograms are the same, except for the bottom line on the 2nd one, adding delta to the
monogram? So certainly A, O, P, T, V and possible I, M, N, X.
Regards
Gert