A real challenge !! (for both faces...)
it could be a dragon looking back a little like Val. n° 81/ 141 (Rasht) ?
The other face shows overstamps ( 2 at least), and the mysterious oval characters at bottom of your picture are likely the eyes of a sunface (with 180° rotation)
With a rotation of 45° anti-clockwise, at left, there is a long "A" cut by 2 letters "
ن " or "
ن and
و " like on Val. n°37 / p105 for Nakhshawan
