Over the years I have found that copy trade labels are easier to spot if you know a couple of things and you use a X10 Loupe. First off laser printers where not in lets say the public hands until the end of the 1970s also Ink Jet or Bubble jet may be a little later. Though you folks may have had these items a little earlier than us brits. With a X10 Loupe you need to look at a thin line in the printing and you will be able to see small ink dots on the outsides of the main printed line, this is the give away of any printer whose method of printing is to spray ink.
A Laser printed label is a little different, don't look at the print look at the unprinted parts of the paper for the tell tail signs of small printed dots because no laser printer has a perfectly clean drum and toner is a bit of a loose cannon and can find its way on to the paper.
I have also come across photographically produced labels and on this side of the pond every one I have come across is printed on photographic paper that is more like card than paper.
A lot of the original vintage trade labels where printed on high quality paper containing a lot of cotton so thin crisp and still looks fine after many years.
The print method is easy to detect because a lot of trade labels where produced for Gun Makers by Artisan printers in small batches, on "Movable Type" printers using real printers inks with clean printed lines and type.
The one type of label that is extremely hard to detect genuine from reproduction is the hot block leather or paper versions because the system has been in use for easily a hundred years. And unless you can do an analysis of the print foil making sure it is metal of the correct age, rather than the plastic foils that have crept in to use in recent times.
I say this about the hot block printers because I have one myself and it is now extremely simple to produce a hot printing block photographically, also you can still obtain low karat gold hot blocking foils and Moroccan type Leather is still available.
I am not saying this is the definitive information to be able to make the decision reproduction or not because there are a lot of exceptions though it is an enough of a help for you to start to look for things that are not quite right.
