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Collecting printing errors

The "doctor blade" variety.

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Fred Sellars01/03/2021 15:23:47
590 forum posts
257 photos

Amongst the different varieties of printing errors to be found on stamps is the one known as a 'Doctor blade' flaw. These particular errors are not catalogued due to the fact that they are a non-constant flaw that can occur when a fault develops on the blade that removes surplus Ink from the printing cylinder, some of which can be found in sheet margins as a straight coloured line usually of a vertical nature in the same colour as the stamps are printed with, they can vary from a faint thin line to a much broader one.

Although collectable in this condition, preference is given when the flaw affects the printed stamp itself, making them quite unique and possibly valuable,as a printing error of this nature should have been previously removed by the quality control section prior to being dispatched to various post offices.

Here is a good example showing this type of printing flaw, whereby the stamps and the margin have both been affected.

img_20210301_140145.jpg

Always worth looking out for ! Fred.

Edited By Fred Sellars on 01/03/2021 15:27:58

Fred Sellars04/03/2021 11:33:10
590 forum posts
257 photos

Sometimes it's difficult to assess the value of a "doctor blade" flaw that affects the stamp due to their irregularity and variations of prominence that can occur, and as a guide to their possible enhanced value one can only assess them against a regular printing error that normally occurs once per sheet, in many cases the regular printing errors are quite minuscule as opposed to the doctor blade errors.

A good example can be seen on the next attachment with some dealers asking around £12 each for a single copy to be found on row 12/5 of every sheet ...........

img_20210304_104346.jpg

A "doctor blade" is much more prominent than many of the constant printing flaws to be found, so how does one assess its value ?

Fred.

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