Molten Metallic Copper 1940s 5cm Buckle

An extraordinary colour - like slightly aged molten metallic copper, lots of depths and variations on its shiny polished lucite surface.
And a most appealing design, straight lines and curves, all at the same time
5cm tall, and 4.5cm wide, gently curved for a perfect fit on your belt.
The inside aperture is just over 4cm tall and 1cm wide.
I found these in an old haberdashery warehouse -they are in excellent unused condition.