Do you have any pictures/scans you can upload, or can you read any more of the writing?

"This indenture" is a phrase that was (and still is) also used for real estate transactions, so we'd need to know more about the text of the document to fully discern its meaning.

As for verifying its age, without knowing where you're located, your best bet for identification is probably to try the nearest large university. Look up their history department for someone who specializes in that era. They may not be able to help you themselves, but they'll almost certainly know someone who knows enough about these kinds of documents to help you identify yours.