I think that one's too far gone to attribute exactly. The date would be 11th or 12th century. I think I recognize a Hodegetria
type on the
obverse (from
Wikipedia: A Hodegetria (Greek: Οδηγήτρια, literally: "She who shows the Way"; Russian: Одигитрия), or Virgin Hodegetria, is an iconographic depiction of the Theotokos (
Virgin Mary) holding the Child Jesus at her
side while pointing to Him as the source of salvation for mankind. In the Western
Church this
type of icon is sometimes called Our Lady of the Way.)
Regards
Gert
