Well IMO I think the "New World" turned into the "World Traveler" in 1950. The "World" was the cheaper model and it seems more correct to me that the "World Traveler" was more in line with the "New World." However, I don't really think that one turned into other as the "World Traveler" was a completely different look and feel than the "New World." But I guess if you had to pick it would be "New World" to "World Traveler." I think
@SirMike1983 told me once that there might be some straggler 1950 NWs but I haven't come across them. There might be a couple out there... And I don't think
@Miq has any in his list.