This forgery is actually not that common. It looks rouletted instead of the usual perforations. It probably originated from Italy. Well known forgers such as Nino Imperator of Genoa and Erasmo Oneglia of Turin would be among the prime suspects.
When compared to the 4c stamp just below, one can see that the colour is the wrong shade and the details are less well defined. The main giveaway is the chinese characters on the right. For some reason, it was wrongly inscribed 2 cents in chinese instead of 4c. This error is present in all the forged values of this issue.