This is a 5″ tall adult pony. All of mine have come in lots from the UK; sometimes they are branded as Tesco on the belly. They all have the same head with inset glass eyes. This is a special mold as it features joints. The neck and all four legs have a joint, so you can adjust position somewhat. Like this:
They are marked L-04-MB on a front hoof and MADE IN CHINA on back hoof.