Ancient Celtiberian (Celtic) or Roman brooch (fibula) from an old collection of Iberian items

An ancient bow-shaped Celtic brooch, known as a fibula, from a collection of Celtiberian items (see more info below). This brooch is heavily corroded and missing the pin/spring/catch system).

This brooch is from a Celtiberian collection of artifacts. It is made of bronze. It measures approximately 36 x 15 x 7 mm.

Provenance -

We bought a collection of artifacts at auction in Switzerland (La Galerie Numismatique, September 28th, 2024); we are researching each object and offering them for sale individually. You can see the collection in the pictures we posted.

In the course of our investigation, we found that the artifacts had several names of places in the Celtiberian region written on them, for example "Salienca". Also, the brooch design was unique to the Celtiberians (Google search "Celtiberian Fibula" to see similar examples). We've come to the conclusion that the collection is specific to the Celtiberian era/region.

Wikipedia tells us the Celtiberians "were a group of Celts and Celticized peoples inhabiting an area in the central-northeastern Iberian Peninsula during the final centuries of the BC. They were explicitly mentioned as being Celts by several classic authors (e.g. Strabo)."

Condition -
See pictures. Heavily corroded. Missing pin/catch system. Someone wrote a place name on it, but I can't find a place with such a name.