That is part of a Victorian era British revenue stamp. It would have been attached to a document.
There are several threads here about these.
Here's one thread. Your item goes on the back and attaches through the document to the actual revenue stamp on front.
Check it out. Interesting reading.
https://goscf.com/t/15553&whichpage...ment,revenue
Posted 04/02/2017 5:18 pm
