A certified copy is a duplicate of an original document that is certified as a true copy by the officer having custody of the original. ...
www.michigan.gov/sos/0,1607,7-127-24451-27051--F,00.html

A copy of the original document is certified to be a true and accurate copy of the original document. You must bring with you the original document and the ...
www.registrar.uwaterloo.ca/help/commissioner.html

Consignor or Consignee will indicate on the original Bill of Lading ... be the actual cost of goods supported by certified copy of original invoice not to ...
www.fedexfreight.fedex.com/fxfrulestariff.jsp?as_rules=carr...

If it's a factura, it will have several copies, and the 1a via is the "top copy" with the original signature. It's also called the "original," but that's not very precise terminology, and it's *not* the opposite of a photocopy.

27,200 refs for ["top copy"+invoice]

Note the distinction between top copy and original in the first example:

**Invoice 1 of 2 annotated with the processor's initials will be the top copy. Invoice 2 of 2 is the original invoice.** Three (3) copies of the invoice are ...
tpot.ucsd.edu/Acquisitions/Serials/invoice.html

Mail completed **top copy** (white) to:. Guardian Fiberglass, Inc. ... Provide actual sample of finished item and invoice with description of item(s). ...
www.guardianbp.com/docs/coop.pdf

It is hereby certified that this invoice shows: (1) the actual price of the ... **Sign the top copy of this form** and place all three copies in the pouch with ...
www.usps.com/forms/_pdf/ps6182.pdf