One can say that a stamp is well centered, jagged or unperforated, has all the same margins. This feature is of great impact in the material value of the stamp. In the classic stamps, as a result of the rudimentary procedures of the time stamping, the exception was that they were optimally centered, hence the increase in the price of the copies.

The current stamps, is the opposite. Modern printing techniques make that well centering is the rule and that only by way of exception, stamps appear not very well focused vignettes. Parts are considered as a rarity, and raise its value.