Mine would have to be my great great grandparents Bible. It was given to them on the marriage in 1862, and lists all children's births including the unregistered ones. It passed from my gg grandmother Emily Dresser Healy to her daughter Katherine, then her daughter (my great aunt) Harriet Blake, then to me as the next girl in the family line. I wouldn't part with it for anything. I also have the Bible my grandmother brought from England as a Home Child in 1910.