Thank you all. The vessel is a French built 52' monohull
built in September of 2007 with Volvo
4-blade folding prop. Owner states that the prop was not fouled but that the shaft snapped when the engine
was put in reverse at full throttle to help free vessel from a reef (very little damage to the keel
so was not considered to be a hard grounding). Once I am certain of the alloy used, will post for anyone who might be interested.