Here you can select the number of cards to be placed in a row for each of supported screen resolutions. Your current resolution is highlighted in this way.
it is a genuine unused, o.g., hinged, block of four, with thins in the top stamps, a tiny edge thin at the left of the bottom left stamp, and a diagonal crease across the bottom stamps.
it is a genuine used, horizontal strip of three, with parts of black San Francisco c.d.s. cancels, a repaired internal tear at the upper right of the right stamp and the top frame lines and top margin added all the way across the strip.