Gorgeous lid! The "less than 5 known" is the rating from Barbara & Sonny Jackson's 1987 book, not a rating from 2022. Unfortunately there has been no update to that book that I am aware of; there are a number of American lids that have surfaced since then that are unlisted in that book. Definitely a super scarce lid, but there are a few more than 5 around so far as I have seen. Congratulations!