Know what it is, and what it's actually worth, before you hand over a cent.
checking the base
Circa 1897–1903, before the “Wagner Ware Sidney -O-” logo. Exact year can't be pinned to a single year.
The rare early variant. Well above a common later Wagner (~$250 at dealers). Condition-dependent.
Exact year and value can't be nailed from a photo. Confirm the mark and heft in hand before you commit.