Limited edition of300 pieces sinn watch 144 st s jubilee bracelet limited edition one of the most traditional series from the house of sinn spezialuhren celebrates its 40th anniversary in 201 the 144 to mark this special occasion a limited edition of 300 sports chronographs is being produced in the 144 st s jubilee series with black hard coating the two engravings 40 jahre and eine von 300 on the back document and mark the occasion the chronograph 144 st s jubilee features a solid brace