I was browsing the web and came across four of these kits. Got them all!
I have never seen these before. Paramount plastic kits in 1/30 scale made about 50 years ago. All appear to be complete and in good condition.
Here's the first of them.
Kit is intact with instructions. Parts are plastic and rubberised plastic for the reins.
One of the horses clipped together. looks to be about 1/30.