"It's the small things that make life interesting" Quote by Me.
Another - "I don't have a lot, but I like what I got."
Back to the envelopes for a bit:
These two are identical (size, wm, knife) except...........
What's interesting is that it only lists the "Rounded Bust" under 'White Paper":1238a 13 10 57, with only a modest advance over the "Squared (normal?) Bust"
But the "Rounded Bust" is not listed for the other paper colors.
These are 1284 13 10 57 'Oriental Buff"
Probably a simple explanation to be had.
Illustration from UPSS catalog: