This coin has been mounted.
Dear maudry, lovely coin; coin details:
Qajar, Nasir al-Din Shah, Gold Toman, AH 1278/1862 AD, dar al-Mulk Tabaristan (طبرستان) mint (AH1264-1313 / 1848-1896 AD),
Obverse (First photo): from bottom to top reads:
السلطان ابن السلطان ناصرالدین شاه قاجار , al-Sultan Ibn al-Sultan Nasir al-Din Shah Qajar.
Reverse (Second photo): within a lovely Octogram frame, reads:
ضرب دار الملك طبرستان ۱۲۷۸ , Zarb Dar al-Mulk (Tabaristan) AH 1278.
Tabaristan (طبرستان), also known as Tapuria, was the name applied to Mazandaran, a province in northern Iran. Although the natives of the region knew it as Mazandaran, the region was called Tabaristan from the Arab conquests to the Seljuk period. Tabar means mountain and Tabaristan means the land of mountains. Some other historians have written that due to the dense forest and wildlife using tabar (axe طبر) was common among the inhabitants; so this area was called Tabaristan.
Thank you Maythem.