in position in the orientation of fig1 and 3 the compression spring 66 of the latch mechanism 58 will force the locking plate 60 of the latch mechanism upwardly into the groove 40 of the pivotable header 30 such engagement preventing the pivotable header 30 from moving from the upright orientation depicted in these figures a suitable sign 54 is retained within the groove 48 via the clip member 50 in the upright orientation of fig1 and 3 the sign will extend upwardly above the level of the shelf 12 and will obscure from view any inventory stored on the shelf behind the sign 100211 when it is necessary to change out the sign or to access inventory on the shelf 12 behind the sign a person will pull downwardly on the head 64 of the latch mechanism 58 compressing the spring 66 between the locking plate 60 and the support flange 28 such movement lowers the locking plate relative to the upper plate section of the pivotable header past the lower edge of the downwardly extending rear face section 34 the weight of the sign and the pivotable header will enable an easy pivoting motion of the pivotable header via the hinge arrangement 56 such that the pivotable header assumes the lowered orientation illustrated in fig2 and 4 in this orientation the sign will be 180 u00b0 opposed to the orientation of fig1 and 3 essentially pointing straight downwardly in this orientation it is a simple matter to exchange one sign for another or for staff to access inventory stored on the shelf and.