Early 1900s filigree brooch

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An old Art Nouveau filigree brooch in excellent condition. I don't know the material. Usually, this type has its stamps on the pin hook, but this has age patina, so I cannot see any or no stamps. It looks like old gold-plated silver, but no guarantee. Weight = 5g. Size = 3x4cm.

PLEASE READ: in my shop - only pre-owned items; delivery worldwide (and traceable only!); I pack very securely!; shipment outside EU from 145 DKK - ask me before buying; payment without delays; shipping 1-3 days after payment, or as later as you need; complaints about shipping cost and delivery timing NOT acceptable (I don't influence postal services - please feel free to contact them and check my prices, timing etc.); please make sure to pick up your package timely, otherwise you will need to pay shipping again, outside Tradera, ONLY via PayPal or MobilePay, and the price will be higher than the previous one because of a different shipping company. Please note that it's YOUR responsibility to trace your shipping. SORRY, I DON’T REFUND FOR ITEMS DAMAGED OR LOST DURING SHIPMENT, AND ITEMS NOT PICKED UP BY YOU FOR ANY REASON! Thank you in advance for understanding.

Detailed info - please read "About the seller".

Pls ask if not found something in my shop - I have a lot of stuff.