score:66
The number of legs is correct. It's the number of heads that is wrong.
The chariot depicted is an Olympic quadriga which was driven by four horses.
The artist probably found it difficult to make a design that included all four horse heads, so he just drew two of them.
Upvote:7
I think Tyler is right, but it's also possible that the horses were depicted running as fast as Marvin here.
(source: cartoonbucket.com)