Thanks Kalwisti,
That's actually very helpful information.
I've been digging around too and noticed this CNET video from June 1, 2011 that shows the Ysobel font as an option (at minute 1:35)
http://www.cnet.com/videos/new-nook-e-reader/
Based on your observation and the date of this video, I'm starting to think that perhaps only the Nook Simple Touch came loaded with the Ysobel font.
Thanks for the extra info. The hunt continues.
Mr.Moe