Nearly 50 years ago, I
inherited a stamp collection from my grandfather. Albums, stockbooks, cartons, glassines, etc, etc. Some was highly organized, like the albums, but there was a lot of stuff that was unorganized and unidentified. His US used album didn't have spaces for many of the 1867 grills. Omitting the Z Grill, I get - most of those are rarities that most collectors will never get, but many of the others were omitted, too. It was a Harris album, I believe, but I can't remember for sure. Years later when I was going through the rest of the stuff, I found (yet another...) glassine with a bunch of grilled stamps in it. When I went to try to ID them, I realized that those were all of the grills that were not shown in the album! I got a pack of blank pages and designated a page for each of the different grills and had plenty of stamps on them. No Z grills, though. Anyway, it is clear that the one glassine was his way of saving the un-listed grills. There was nothing on the glassine to indicate they were special, and they were in a carton of random crapola - this one glassine was worth multiples of the remainder of the carton. I suspect Gramp simply figured he would get to it someday and died before that happened.