Amber bracelet hallmark?

hello, this is a Polish bracelet. Does anyone know if there is provenance information?

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A late 20th century Polish sterling silver bracelet, maker JZ, Gdansk.

https://www.etsy.com/listing/1793058979/mid-20th-century-jz-baltic-egg-yolk
https://www.worthpoint.com/worthopedia/vintage-jz-sterling-poland-gdansk-3110506318

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