Some models have a dorsal stripe, so the color could range from a light bay to buckskin (even though buckskins are not registered as Hanoverians). This set included a black Keen, light bay/buckskin Ginger, and bay Andalusian Foal. Box Copyright date is 1991, so this set may have been released later in 1991.
Overstock Warehouse models were sold in 1996 with a green stable blanket as #8905.