Vintage Work Shirt Metal Buttons Lot, Big Yank, Free Land, King Kard, Sweet Orr

Nice lot of vintage metal buttons from the 1940s, 1950s. They all have names associated with work shirts or work wear. All are metal.

1 metal piece with an 'S' on it. I don't know if it was used as a button or part of a snap or stud. 5/8 inch. Very good, light wear
2 silver 'King Kard' buttons, 5/8 inch. Very good, light wear
4 'Free Land' buttons are each 5/8 of an inch. The front are metal, the back are something else, like wood or leather maybe? They show wear to the finish and tarnish, wear on the backs too.
2 'Sweet Orr' buttons, 5/8 of an inch. Metal front, wood or leather back. Aged, tarnished, light wear.
1 'Big Yank' button, 1/2 inch across. Wear to the silver finish on the front, maybe it was originally painted?