Haven't seen or heard of any yet, then I found this one today going through some cards. It sure doesn't look like Cowboy to me, what do you guys think?
<a href="http://s1315.photobucket.com/user/kel9052/media/DonaldCerroneerrorcard_zpse47f808a.jpg.html" target="_blank"><img src="http://i1315.photobucket.com/albums/t585/kel9052/DonaldCerroneerrorcard_zpse47f808a.jpg" border="0" alt=" photo DonaldCerroneerrorcard_zpse47f808a.jpg"/></a>
<a href="http://s1315.photobucket.com/user/kel9052/media/DonaldCerroneerrorcard_zpse47f808a.jpg.html" target="_blank"><img src="http://i1315.photobucket.com/albums/t585/kel9052/DonaldCerroneerrorcard_zpse47f808a.jpg" border="0" alt=" photo DonaldCerroneerrorcard_zpse47f808a.jpg"/></a>