Not entirely sure but there's a lot of different settings on mandarake. Most are copies, but some have also been used by the animators. Usually it says on the auction if the animators have used it or not Either way, some settings can be quite cool and it's really nice to see detailed sketches of different characters and environments etc.I have these unusual bundles of production sketches I got from Mandarake a few years back.
Cant tell if they are just Prize photocopies from a cometition/event
or photocopies they gave to out-of-studio or student artists for reference.
Either way its a nice collection. About 60-120 pages each
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@Scrambled Valkyrie I purchased it from a Japanese auction website - if you search under one piece ichiban kuji you will find different OP panels on offer including the panel you are interested in, see link below.
Ohh!, my bad