MEASUREMENTS
As a consequence of the method of assembly of a large number of typographic components to form a printing plate for the overprinting of 100 Austrian stamps (10 by 10), the relative positions of the component parts of an individual overprint were variable. The measurements of these components parts are the first step in authenticating one of these overprints. Mikstein devised a system of measurements in which the left edge of the P in POCZTA is the reference line for the measurements. The distance between this reference line and the left edge of the rhombus and the distance between this reference line and the left edge of the P in POLSKA are measured. A reticle that I designed a number of years ago to make these measurements is shown to the left in Fig. 2. I no longer use the reticle to determine these measurements. I now scan the overprint and use the Adobe Photoshop 7 software program to determine these measurements from the scanned image, as shown to the right of Fig. 2.
I have listed in the table below, the values that I have measured for all 100 positions of an overprinted sheet of the 1Kr Austrian stamp. The first value is the distance of the left edge of the P in POLSKA from the reference line - L is to the left and R is to the right , and the second value is the distance of the left edge of the rhombus from the reference line -- all the units are in tenths of millimeters (i.e. 8R/58 means the left edge of the P in POLSKA is 0.8 mm to the right and 58 means the rhombus is 5.8mm from the vertical reference line).

From my experiences in examining these overprints, I could only claim an accuracy of +/- 0.1 mm. Thus from a table of measurements versus positions, I would have to examine all possible positions within +/- 0.1 mm from both the delta P and the delta rhombus positions.