At first glance, it appears that the arrow is pointing in the wrong direction. After observing the plate proof at LAC, Leopold Beaudet states, "In fact, the tip of the "real" arrow, which points in the right direction, is a bit further down, too far down to appear on the stamp. However, the shaft of the arrow and the flared line forming the right side of the arrowhead both extend upwards above the tip of the arrow.  It is the extensions we are seeing, giving the impression of an arrow pointing downwards."This stamp is part of a vertical pair (72LL90 and 72LL100) and the upper stamp also shows interesting marks. At the lower right of 72LL90 there is a strong guide dot and what appears to be two intersecting arcs.