You will often hear an antique dealer mention, in reverential tones, that an item has its original finish. This often precedes the disclosure of a price that exceeds your credit card limit. The term original finish means just that, a piece has the same finish today that it had when it was first made. It's the original protective coating, the varnish, wax or polish that was applied to protect the wood when the piece was produced.
Original finish is significant because it is one of the factors used to assess the value of a piece. If you have two end tables, one with its original finish and the other without, the one with the original finish is more valuable. As soon as a piece has been stripped of its original finish, it has lost part of its integrity and is, therefore, less valuable.