Brass Stirrup Irons from Mexico

They are brass, but when you look carefully the alloy is poorly made and has many different colours. Polished they look like gold, they are probably early 19th century but it not easy to know. They could be older. One has a hole in the side, not sure if that was damage or if it was made like that, they have the ususal motives which suggest they are Mexican. 

Purchased from Crow’s Auction Sales Dorking.