Multiple marks were applied to prevent tax evasion (have seen it on French and Austrian gold). I remember having seen the system explained in Tardy, but the book is not with me at the moment. As far as I recall, number of eagle marks is consistent with weight. In short, it was done to prevent the following: duty paid on e.g. 30 gram bracelet, assayed, and then returned to the workshop and used the assayed clasp for 60 gram bracelet, meaning tax evasion for 30 grams of gold.
In this particular case, both parts should bear marks.
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