Scott 552 Frame Height Variance?

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A calibrated yardstick?

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There are different accuracy classes that may vary depending on the country and manufacturer. In Europe, accuracy classes are defined according to DIN 862 (German standard) or ISO 3650 (International standard).
The accuracy class is typically indicated in fractions of a millimeter. For example:

Class I: 0,02 mm
Class II: 0,05 mm
Class III: 0,1 mm

There are also yardsticks with higher accuracy used by professional users, such as in mechanical engineering, tool manufacturing, and measurement and testing technology.
The higher the accuracy class, the more precise the measurement result. However, it is important to note that higher accuracy may be associated with a higher price and that sometimes higher accuracy is not necessary depending on the application.

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I reviewed your earlier threads. Please post the scans of your stamps together with the documentation of the measurements and comparisons either in this thread or in a new one.