The pictures show an Icons Nautilus, as modelled by Scott Brodeen.
I don't know if it's a knock off, or if it is being cast with his permission.
I have a casting of an Icons Nautilus, that was very well rendered. It wasn't from the outfit you describe, so I can't speak for them, however the Icons Nautilus is a lovely rendition when suitably cast and builds into a super model.
One note, there are no hull plating lines on this model- just rivets. At this scale the omission is barely noticable , however.