These kinda remind me of NYC subway tokens. Some of you will know more about these than me. Juan, you for one have sure seen your share of the shirts & jackets these buttons went on. These are just some of the old workwear buttons acquired by Jared at The LEVIS Tailor Shop. Below I've listed some of the names on these buttons:

Standard Brand, Big Yank, The Gem, M.Nusbaum Marville MO., Nation Wide, Katz Brand, Our Own Make, Eleto, Sweet Orr, For Gentlemen, PayDay, Macdonald & Campbell, P.B.Co., Signal Overall, GEO Floyd Philla., Van Wert Excolsior, Shippensburg Rummel Himes & Co., Myers & Rathfon, Carter's, Depams, Uncle Sam, Eckhart