SevenFriday Watch M1B/01M Urban Explorer M1B/01M. The M1B/01M is the timeless M1B/01 with a factory fitted metal bracelet. The metal bracelet has been specifically designed in-house, in order to fit perfectly with our iconic case in terms of style, quality and comfort. The addition of the stainless steel bracelet to the M1B/01 turns it into a definitive statement piece.