I was going through this box of system floppies today (the second part of the box I got earlier this week with the 800K 7.1 floppies inside) and found...

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(yes, let's build some suspense)

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A HD20 FLOPPY!!!!!!

There was also a set of 6.0.4 in there and a few other sets of system 6 and 7 plus some guided tours (SE and II) and some drivers, etc. Also a nice copy of Print Shop Deluxe, even has the graphics folio guide with it.