According to an inscription on a nearby gravestone, this mosque was built prior to 1449.
It has a square prayer hall (8,40 x 8,30 m), which is preceded on the north side by a porch, 8,40 m wide and 3,4 m deep (these are the inside dimensions; the outside measures 10 x 14½ m). The prayer hall is covered by a dome.

On the picture: The mosque seen from the East. The structure on the foreground is a ‘şadırvan’, a type of fountain that is usually built in the yard or entrance in front of mosques or other buildings where ritual prayers can be held, with the main purpose of providing water for drinking or ritual ablutions to several people at the same time, but also as decorative visual or sound element. It is a typical element of Ottoman architecture. It is also called ‘abdest alma çeşmesi’ (= fountain for ablutions).

Correspondent: J.M.Criel, Antwerpen.
Sources: ‘Vakıf Abideler ve eski Eserler (volume III)’ - Vakıflar Genel Müdürlüğü, Ankara 1983 & Wikipedia.