In 1984, I purchased a set of MNH special handling stamps in blocks of 4 (two had plate numbers). Because I already had a set of singles in my album, these went into a stockbook and have remained there since then.
Today, as I was contemplating breaking down the blocks to post a set of singles for auction on SCF, I "discovered" that my 25c block was from plate 17103 and the stamps had the "A" and second "T" of "States" joined at top.


Things like this make me wonder how many other "finds" remain buried in my albums and/or stockbooks due to my ignorance or inattention.