Antique Solid Bronze Duck Hunting Dog Inkwell

This wonderful heavy (3 Kg) inkwell in perfect condition (see last picture) was purchased several year ago to Rubén Marhuenda https://www.facebook.com/profile.php?id=100009653687840&ref=ts&fref=ts .
The expression of the Golden retriever carring the died duck is wonderful, with great details. I is signed "C. Porta". I found another similar pieces on the web not signed http://chennai.quikr.com/antique-bronze-dog-and-duck-inkwell-W0QQAdIdZ188776826; http://www.ebay.com/itm/Antique-Solid-Bronze-Inkwell-Hunting-Dog-Labrador-Retriever-Duck-Bird-Hunter-/351461971194?_ul=BO&nma=true&si=ow6EMjwI7EkH6HqIzG8i3lgwkQU%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557 or with different signatures, but ours seems the better preserved. Thanks for any comment about the artist.