Well, this mystery is a little bit solved, at least.
I got mail order pattern 4633 a little while ago but have had a dickens of a time finding a date for it because it's a 4000-series number but not an Anne Adams.
You can tell from the style of the dress that's from about 1946-1948, so that helps, but it's still not coming up in searches.
The style of the packet is in the Sue Burnett/Barbara Bell/Iris Lane family but it's none of those that I've been able to find, and Anne Adams seems to have monopolized 4000-series numbers.
Well, kids, today at lunch I got on Newspapers.com and dug up Sue Burnett 8083 from 1947.
. . . eh, I'll take it.
I still don't know what nameplate it is but at least I've confirmed the "family" and a close-enough date.