__ Calendar, or Os, Days and Dates Before 1752
Puzzle 9 of Jane Austen Hard Pack
Question is: __ Calendar, or Os, Days and Dates Before 1752
and the answer is: OLDSTYLE
Word Meaning:
OLDSTYLE — (typography, often attributive) A traditional style of typeface designed to mimic the handwriting of scribes.
Definitions from Wiktionary.