
The stamp on the left is a legitimate Australia NSW SC A27, #79, wmk 55, and perf 11x12. Unfortunately it is poorly centered, and thin in the lower left corner, but given the 1894 cancel, it definitely appears to be real #79.
The stamp on the right appears to be a poorly printed forgery. For every forgery I have ever detected in the past, one of the primary ways to identify it as a forgery, beyond questionable printing, has been the lack of a watermark. The thing is, this forgery has a wmk that looks like a very good match for wmk 55. I did some internet sleuthing and did not find any hits on forgeries for this particular stamp.
Does anyone have a good source for forgeries of these NSW SC A27's? Or any other information on this particular issue?