It's actually "Gebr. Senf" (Grebruder Senf). The Senf brothers were well-known and prolific forgers (including various Italian states issues), though most of their work included a "specimen" or "facsimile" overprint. I can't speak specifically to this stamp but I wouldn't be placing any bets on it being genuine.
wrong color the 1g is black ,the 2g is blue .There is a black stamp but it is extremely rare{ $60,000} ,only found used. Yours looks like a forgery . Let me know I have various values of the real stamps from that set {do not have the black 2 g }if you want me to post pictures.
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Posted 09/05/2014 2:45 pm
