I've had a few of the Estes Blackbirds,the Chinese one in the bag and the US one in the box, and after I pulled all my kits out again I realised the one I was looking at was 307003, it's in three languages and the dimensions are metric. My Master's Series Space Shuttle was the same. I assume it's simply for the international market but how rare is this? I'm thinking I like it,it's just a little different.