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I believe it is covered in the book "Heilegem und Profund", which is a study of Medieval religious and secular medals found in the Low Countries - primarily because a number of the medals were recovered from villiages submerged then and now reclaimed (there were a series of these floods - the History of the Low Countries is as much a story of a battle against the sea as anything else).

The problem is sections of the book contain essays written in Dutch, English, and I believe German, so the question is which language is it written in. If I can find it, I'll wing off a copy to you (unless it's brief enough to post here).

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