Watch List notes:

TURKEY: Mahmud II, 1808-1839, AV çeyrek (0.80g), Kostantiniye, AH1223 year 12, KM-608, Uncirculated, ex. Ken Bovencamp. Incorrectly called a ¼ zeri mahbub in KM, this type is actually a ¼ altin (or ¼ ashrafi), similar to KM-543 of Mustafa IV. A ¼ zeri mahbub would weigh about 0.58g.

Estimate: 110-150 USD