Some of my interests are not on this survey/poll:
1) errors (offset, SN, & then miscut)
2) 54 asterisk replacements (esp $5), then X replacements
and only sheet replacements if they have a unique feature (eg: 03 BEK, K/T FDZ)
3) Journey lost prefixes (BEL, 03 BER, BEP)
4) low numbers
5) signature or year change-overs (short issue)
6) Test notes
(not necessarily in that order)