Watch List notes:

The Eparch Collection of Roman, Byzantine and Islamic Weights
ISLAMIC WEIGHTS

Ottoman Empire. Mahmud II, AH 1223-1255 / AD 1808-1839. Weight of 5 dirhems (Bronze, 17x16x7mm, 15.54 g), an octangular commercial-weight. Tuðra of Mahmud II, dated 1223. Rev. Plain. Kürkman cf. 221-225 (10 Dirhems) and p. 88, middle. Clear and with an olive-green/grey patina. Very fine.

From the Eparch Collection.
Mahmud II was one of the great sultans of Ottoman history, famous for his reforms, including his destruction of the Janissaries in 1826 and the epoch-making Tanzimat (=reorganization) of 1839, which was responsible for the modernization and secularization of the Empire.