A most satisfying deep forest green, with lots of colour variations and depth,

characteristic of vintage casein plastic.

Each buckle is a little different.
And a confident 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.
So would fit a belt up to 4cm wide.
I found these in an old haberdashery warehouse -they are in excellent unused condition.

The photos were taken in bright sunlight (1st 2), electric light (3rd)