There is very little difference in paper quality between original and fake issues of the so-called "Numeral Design" stamps (Mi #6-8). The colour can vary quite much both on originals and forgeries, but the colour application is much less even on forgeries. This is especially the case in the lower part of the design around the letters "Penni". Spots are few, however, both on original and fake issues [1]. The most important characteristics to distinguish originals from forgeries are:

1. The upper and lower waveline is often touching the outer frame on the forgeries, making the spaces appear as white spots. On original issues the wavelines are only occasionally touching the outer frame.
   
2. The frame line around the central "Eesti Post" field is rather narrow and even on the originals, thicker and more uneven on forgeries.
   

Original:
Forgery:

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Mi 8

Forgery

Original

Original:
Forgery:

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Source:

1. E. Sjogren: "Distinguishing features of Jaan Lubi forgeries of Estonian stamps I", Eesti Filatelist #28, 1982

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