I Tarna, nice to hear from you. There's no way to find out if the seller got the number wrong because as I usually do, I checked on the Internet for copies of this pattern and didn't find any. It seems quite rare and is really beautiful. You're right, there's already a Simplicity 1954 from the 1940s, but it's a reissue of Simplicity 4365. Otherwise, looking at a Simplicity catalog http://what-i-found.blogspot.com/2009/04/simplicity-fashion-preview-1947.html the style and numbers seem to match the style and number of this one.