I agree! There should be a Sticky so that all who question the Mystery Helmet's lineage could refer to one post, instead of having to search multiple threads for 'opinions' of where we think it came from.
It's almost a tale of folklore at this point.
"Well, young whipper-snapper, when I was a young-un, 'bout yer age, we had us this old workshop, runned by a feller name of Don Post. Postie, we used to call him. He hated that name..."