hi, i'm no expert, but I think that is the origianal wagon. The faults I think it has are;
..a, the body is about 2mm too tall, ..b, the top rail of the body should be angled 45 degres not flat and ..c, as beast says, I think it had the incorrect number of (end I think) ribs. Having said that, I have 2 of them, I just angled the top rail with a file and painted it gold again, painted the inside rust colour (a big improvement) weathered them filth and just lived with the height and ribs problem. cheers Nick.