Serrane doesn't have much to say about the 1882 issue except that the originals should perf 15 and the forgeries perf 14; the shades are off; and the forgeries are coarse (grossier...you might be able to translate that better than I).
Unfortunately, there is not a drawing of this issue. I have a few other places I can check.
Here is one of the stamps I'm trying to verify. It was in a lot, with an APEX cert saying that it is a counterfeit. It is perforated 15.5 x 14.5 (it might be 14.25, but my perf gauge only goes in half increments).
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Posted 04/28/2013 12:11 am
The detail about comb perforations is good to know. 
