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These leg stripes are those of Finally's Mr. Amos, a dun perlino Morgan stallion. Leg stripes are typical dun characteristics, along with dorsal stripes, face masks and frosting on manes and tails. Dun is thought to be an ancient pattern with some cave paintings apparently depicting dun horses.
More of Mr. Amos can be seen on the perlino page. Both of Amos’ parents were buckskin and he inherited one cream gene from each of them, making him double dilute for the cream gene. A dun gene inherited from his dam accounts for the leg bars.
Amos is the only perlino dun in the Morgan breed at this time. Thank you to Lynn Peterson of Royal Gold Morgans for providing photos .