S is for medium, 126 is the button number. The front is a flat circle, all with a loop on the back, The material is Britannia pewter. This button is 1/2″. There are 5 buttons with a flat face in different sizes, also a tiny button for shirt collars.
Good for your everyday large button needs like your possibles bag, or a cloak or a great coat.
Matching buttons, 129, 128,130,128 and 147 in descending sizes.