Most of the medals and orders issued by the Ottoman government were struck at the "Darphane Amire" or National Mint in Istanbul.  Although medals did not carry the mint's mark, most orders produced in the last 20 to 30 years of the Ottoman Empire carry a mint mark.  One exception is the Osmanie Order badge, which is enameled on both sides, but breast stars of the order usually bear the mark on the reverse.  The image below shows the circular mark, with the words "Darphane Amire" contained in a crescent.

Just above the mint mark is a smaller mark, which is a silver hallmark that is occasionally found on Ottoman orders.  This smaller mark is merely a circular cartouche with the word "Sah" (Pure).

In some cases, orders are also marked with the Tughra of the reigning Sultan at the time of the award, which is very useful in dating the pieces accurately.