[springer]

Both are genuine, they are just from different eras. There are variations of clasp coronet styles and stamping location on the clasp that changed through the years. (As a side note, notice how many variations of coronets were used on the various GMT 1675s, 16710s and other models.) Additionally, the "50" last link stampings can be found with the large font or the small font or possibly, like one of my bracelets, with both a large 50 and a small 50 on it.