Нашел.
Вот, что написал Stefan Berger 10 лет назад в своем блоге stampsofarmenia.cоm "Please not the blue signature on top – this is the only case I know that a signature was deliberately placed on top of a stamp".
И там же в комментах:
Dr. Ray Ceresa says:
April 23, 2013 at 10:48 am
The blue lozenge signature on the front of these stamps, which has two added stars added separately and thus in varying positions, is the ONLY signature for which there is not one forgery in my signature collection of over 2000 signatures,( which one day I hope to publish). I believe this to be a control marking used by the official distributors of the residual stocks released by the postal department of Armenia to identify genuine material and differentiate it from reprints and forgeries. For the collector the absence of the marking makes a better display but its presence is a guarantee of genuineness. One must not be taken in by digital scans of the marking applied to the face of this issue -they are good copies but every one is the same since the scan is a one pass scan. (No forger has yet , to my knowledge, scanned the diamond lozenge alone and then added scans of the stars as second and or second and third stages).
Выходит, что эти весьма странные знаки на лицевой стороне - действительно заверки.
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Штамп в форме ромба на марках Армении 1922
