This large penannular brooch is the perfect size to use as a shawl pin. Soild brass makes this brooch more durable than typical costume jewelry. It will securely hold your cloak in any weather. It has a classic design used throughout Western and Eastern Europe. Brooches such as these can be found from the late iron age well into the early medieval period.

Here is a tenth century example from Smolenske 

Measurements:
Length: 5 cm
Width: 4.5 cm