These shoe shaped stirrups are made of brass .
They come from South America.
They are known as "Conquistador" stirrups, but they actually date from the 19th or early 20th Century.
The shape would protect the rider's feet from injury.
They have strap like engraved decoration around their openings and long toes.
There are two triangular drainage holes in the base of each stirrup.
The suspension arches are thick.

There are numbers faintly stamped on the end of one tread, they are not legible

Dimensions : External Width 3½" (9cm), height 4½" (11.5cm), length 11½" (29cm)
Weight : 2.2kg (4lb 10½oz )

Ref : stirrup431