I've just bought some Pony Magazines from the early 1950s. Julip weren't exactly a prolific advertiser (but neither were any of the other model horse companies: I've seen no ads from them at all, and am intrigued about that. You'd have thought that Pony readers were absolutely their target market. Why not target it?)
Here is Foxhunter and Lt-Col Llewellyn. I wonder if any examples of this still exist? This model, and the Arab below, both appear to have latex rather than mohair tails.