This is Hector's (Eric Bana) shield from the 2004 Trojan war film Troy.

When the Achaeans make their first attack of Troy, Achilles (Brad Pitt) and his men ambush the temple of Apollo. Hector and his men ride out to meet them. Hector is carrying this shield throughout the scene. It is definitely the one used by Eric Bana as every mark and stain can be matched up on screen. It also screen matches in other scenes in the film.

This shield is made of metal, wrapped in leather. The back is covered in canvas material. The shield is crafted in a waxing moon-like shape. In the middle is a circular symbol made of foam rubber; it features the Trojan symbol of the horse surrounded by a ring of rivets.

All over the shield are markings, slashes, and intentional distressing to represent battle wear. There are spots of fake blood as well.

Riveted to the back of the shield are three leather straps: two were used to wrap around the arm, the other was used as a shoulder strap so that the shield could be worn on the back.