In the episode "Where Silence Has Lease", Commander Riker said that the Yamato had the registry NCC-1305-E. In the episode "Contagion", a display graphic gave the registry of the Yamato as NCC-71807. It was reported that this registry was on the saucer of the starship. For a long time, it was not possible to verify this report. Now, with the blue-ray, it's possible to do so. This is an image from Memory Alpha. http://en.memory-alpha.org/wiki/USS_Yamato By zooming in, I can barely out make the ship's name - USS Yamato. Then, I can make out the registry, and, well, it's not NCC-71807. It's something else. I read NCC-7 80x. The numeral one appears to be missing. The last digit is not the same shape as the first digit. I keep seeing 4. So, now we have three registries for this ship. I don't know what more to say. I feel this is a mess.