This is a group of ponies that all look a bit different, but share a code number prefixed with the letters MJ stamped on the belly or a hoof. So far I haven’t confirmed a manufacturer for these.
There are also some baby donkeys that share materials/symbols with these ponies.
Click images to enlarge.
MJ056B (large running, inset eyes)
MJ049 (mid-size 1, inset eyes)
MJ056D (mid-size 2, painted eyes)
MJ094 (painted eyes; fiber optic mane and tail)
MJ087 (painted eyes, baby)