For numismats, the correct identification of the obverse and reverse is a very important aspect. Until now, no consensus was reached on the problem of the obverse (the issuer side).
Most scholars consider that the obverse is the face of the coin with the legend KOΣΩN. Others, like Judita Winkler, Octavian Iliescu or Carmen Maria Petolescu have sustained the hypotesis according to which the face with the eagle is the obverse and the one with the lengend the reverse.
A strictly technical, numismatical, opinion on this matter is this one:
Carmen Maria Petolescu wrote: