The casting of flans was a widespread practice and you are unlikely to be able to narrow it down through that route.
Very nice example of manufacturing evidence. Not only is there remains of a casting sprue, but you can seen on one side that the two halves of the flan mould were no aligned perfectly. As a result, the coin looks like two half coins that have slid apart slightly in a
lateral direction.
I have been looking at the close up pics. I think the coin is struck, but I am not 100% certain it is not entirely cast. There is a ridge between the top of the
wreath of the obverse/male bust and the flan sprue. That could be a casting flaw or sign that the die was larger than the flan. The details are consistent with a worn strike or a fairly good cast.
SC