It will be an assembled A1200 system from the stock of new(ish) parts that they have, which in the end should resemble pretty well a brand new NTSC A1200 system. I believe that all the parts will be included, however it always depends how careful the assembler is in regards to how the finished job will look like, e.g. possibly some broken/cracked plastic tabs that hold the case together from the inside, etc. I think that your motherboard revision will be 1.D.4, as some time ago I asked them which revisions of NTSC boards they have in stock and they replied with "AT boards only, all rev 1.D.4".