This one was given to us as a gcode file for the ALDI CoccoonCreate printer (Wanhao i3 V2) years ago. We have made over 100 by now, and mostly given them to friends - and sometimes to startled strangers who have expressed an interest in 3D printing....
Looks as though the skin is spiralised?
Am working on a variant from your STL file, just to see. Thank you very much!