This year marks the 60th anniversary of New Era's 59FIFTY fitted. If this is a cap to celebrate the occasion, it is very low key compared to their 50th and the "New Era 59FIFTY at 50" campaign. The cap uses the Diamond Era material, which was introduced early 2013, and features a diamond embroidered in raised metallic silver stitch. Be on the look out for more Diamond related products coming from New Era this year
http://www.neweracap.eu/.