This is brand new unopened Mould King 10169 set. I ordered 2 identical sets from Alibaba to get a better price and waited a few months for them to arrive. Now I need to sell the extra one.
I have not built the other one yet, but it's in a heavy box with a whole lot of pieces and appears to be quite technical and a long build. Best for adults, I imagine. I think that it's one of the largest sets you can buy, especially for an engine model.
Thanks for the interest!