VERY FINE. A RARE EXAMPLE OF THE 2-CENT TYPE I SHIELD ISSUE BOOKLET PANE WITH HORIZONTAL WATERMARK.
As described in U.S. Booklets and Booklet Panes (p. 52), during late December 1906 to January 1907, sheets from eight plates were printed using horizontally watermarked paper, delivered in error by the manufacturer, rather than the normal vertically watermarked paper. Other than the early 360-subject plates for No. 279Bj-k, this is the only U.S. booklet pane known on horizontally watermarked paper
With 1979 and 2002 P.F. certificates