If this is cloth it should be AF50. If it is leather the name Robe would be strange anywhere except Albion because of the Friars. The plusses don't seem to be indicating a caster item. Hopefuly someone will post a screenshot to clear up the questions. If it is AF 100 cloth the AF clamps would bring the effective AF down to AF 50 modified by the quality and condition anyway.
Aelwr