Dansco Replacement pages are used to update older versions of albums or replace worn pages. This page holds Large Cents from 1834 to 1839 and replaces page 4 in Dansco Album 7099: Large Cents, 1793-1857.
The photo of this page shows a slot for a coin that does not exist. I'm sure it's a typo. The slot labeled "1834 Sm 8 & stars, Med ltrs" should be "1834 Lg 8 & stars, Med ltrs"