The counterfeiting of pencils could be a lucrative trade, especially during the 19th century when laws protecting international trademarks and patents had yet to be written. Such was the case for A.W. Faber, whose growing presence and reputation in the market provided ample opportunity for fraud:
The American Stationer (1875)
As the article mentioned, fraud followed the Fabers to America, prompting notices like the following:
The American Stationer (1875)
Here are some examples of the Faber stamp and counter-stamp, from the late 1870s:
But, couldn’t they just imitate the counter-stamp, too?
Contrapuntalism 
Oh, I didn’t realise Kind Ludwig II had a special interest in Faber-Castell. Thank you for this great article.
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Lothar (von) Faber was an advisor to Ludwig’s father, Maximillian II, who had granted his peerage. But I’m not sure how much interaction he may or may not have had with Ludwig II. I imagine though, that favor would have followed from King to King.
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I bet it would be interesting to find a counterfeit now!
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I’m not sure, but I think the Faber-Castell archive in Germany might have some examples.
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