Regular Run Stablemate Assortment
#5185 Morgan Mare
Though the box and dealer catalogues show #5185 with a near-hind stocking, models with four solid legs were found right off the bat. I don't know what the production break-down on this particular variation is, but both seem fairly easy to find.
I've never seen or heard of a variation with markings other than those shown above, but it is possible they're out there.