Pieces like this one, especially if unmarked, are hard to pin down. While it certainly appears older, the casting technology used on large pieces like it continued to be used long after other more modern techniques had become the norm for cookware. Therefore, we see the bottom gating or sprue marks on large kettles still being made at a time when skillets, etc. had all moved to side gating. Yours has what appears to be both a sprue and a gate mark, indicating the possibility that it was a copy made using an older vessel as a pattern.