That’s the version of the photo that lead to the idea tha Billy the Kid was left handed. Some where along the line, probably during newspaper publishing, the image was reversed.
Tip off is the apparent location of the rifle’s loading gate which was manufactured on the right hand side,
Button locations also support this, though only by means of convention.
Billy the Kid was not the Left Hand Gun.
Right handed military parade rest with weapon on the right
I thought all tin-types came out flipped backerds.