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That looks very similar to what is known here simply as Jumbo AP which is very much bigger than normal AP as seen on the photos below and its flesh is also much chewier than that of AP or Gefner.
I have been seeing this large knobbly variety of atemoya in the markets lately and have tries it.It has few seeds unlike AP and Gefner and it sweeter and better quality than those. This one is well over 2kg and they get at least double that size with 1kg to around 3kg seeming to be pretty standard. Pink's Mammoths do get much larger but those in the markets are not the whoppers and Pink's Mammoth is mis-shapen and almost flakey inside such as in the broken apart one below and an intact one on the scale.Could this be a new child of Pink's Mammoth or does someone recognise its variety? Maybe it is just new to my area.When I chop it open I will post a pic.