hi Sue........ In the States, from the 1920s to 1950s, there was something called 'Elegant Glass' - another of the Depression era products, but 'Elegant' was supposedly a better quality product than the bog standard 'Depression' stuff.............. Anyway, one of the Elegant designs was a pattern knocked out by Cambridge Glass called 'Imperial Hunt Scene', which had riders jumping gates etc., not a million miles from the image on your friend's piece of glass.
Just a thought.