This was a pony-sized model and was basically a pretty ugly looking thing! It was made during the 1960s but I don't have any dates for when exactly it was available.
The top pic is of the older Anglo, possibly late 1950's / early 1960s. The bottom pic is a horse from the early-mid 1960s. His legs are bandaged up due to age-related degeneration. Unfortunately, sometimes latex does not generally survive well and can degrade due to temperature, sunlight or a poor mix when the latex was cast. Most elderly Julips either go completely solid or "melt". When they go gummy, there isn't much you can do, except cut out the offending gooey mess and remodel with Milliput.