Vertical sundial on the facade, at the entrance on the south side of the ruins of the monastery of St. Michael. The monastery was built at the beginning of the 11th century, and it is not known when the sundial was made.

References:

1. http://www.istrapedia.hr/hrv/1664/suncani-satovi-u-istri/istra-a-z/
2. Medvedec, V., Sunčani satovi u Istri, Franina i Jurina, 2001.
3. Medvedec, V. (1999) Supetar's smallest clock in the world, Glas Istre, August 15, 1999, 18