The number of plates used in printing this value unperforated, has not been possible to determine. The distance between the stamps varies considerably in different plates. In some, they are only 7/10 mm. apart between the tops and bottoms, in others a little over 1 mm. In some they are only 9/10 mm. apart between the side lines, in other fully 1-2/10 mm. Specimens with broad, white margins (A) show the paper to have extended, sometimes 15 mm. beyond the stamps. The vertical lines are (B) 6 mm., or (C) 2½, 3 and 3¾ mm. from the center rows. The makers imprint (D) is about 1½ mm. from the outer rows, but varies slightly in different sheets. The process of making these plates is said to have been; first to mark out on a soft plate of steel the points at which the right vertical line of each vertical row of stamps was to come, by a dot at the top and bottom of the plate. These dots were sometimes too large and too heavily put in, and may be found in some specimens (E) at or near, the upper or lower right hand corner of the stamp. The lines however were not always accurately drawn so that the dot appears (F) on the top or bottom line, at a distance to the left of the corner, or (G) above the line, or (H) below the line, or (I) entirely outside of the stamp to the right. These lines having been drawn, the next step in the process was to put in the body of the design, which had been engraved on a soft steel punch or die, and then hardened, by placing the die successively in the position to be occupied by each stamp on the plate, and "rocking" it back and forth under pressure. As this process was not as perfect as that now employed, the die was not always placed in exactly the proper position, not infrequently being too near or too far from the vertical side lines, or the die was not rocked far enough, and the edges were left imperfect. In the design, it was evidently intended that the outside lines should be equally distant from the top and bottom labels, and the side edges of the block, and that the corners should be exactly mitered. The top and bottom lines are practically always at the same distance from the labels, and one engraver maintains that they were engraved on the die. But specimens are plentiful in which (a) the top and bottom line projects beyond the side line, or (b) does not touch it, or rarely (c) is double or split, or again the side line (d) projects beyond the top or bottom line, or (e) does not touch it. Again, instead of the side line being (f) at the proper distance from the corner blocks, it is not infrequently (g) too far from one or more of them, or (h) too near one or more of them, or (i) touches one or more of them. Again, the side line is found (j) connecting with the next stamp above or below, and occasionally there is a second line (J) near this between two stamps.