Abstract: A display sign has cards that fold on a hinge to display different numerals. An upper latch retains cards in an upper position overlying an upper edge of the cards. The latch has a retaining member that rotates between an open position and a locked position. A lock assembly for the retaining member has a threaded member that is rotatable between a locked position, which prevents movement of the retaining member, to an unlocked position, which allows the retaining member to rotate.