Not only horses are marked 1
Not only horses are marked 2

From horses it is known that they get a brand at a young age. With slaves it's a little different... They can be branded no matter when. Today a longtime slave is ready to be branded by me. I burn an S for slave into the skin next to his sack with red-hot iron... He hangs upside down on the chain hoist in the stable ... Of course he has to thank me afterwards also kneeling and kissing rubber riding boots ...