Geo,
The key is not only did FN outsource their engraving, the did not have a Standard Engraving Pattern catalogued until the 1923 when they resumed importation to the US and catalogued Grades 1-4 and Engraving Patterns A,D, and F.
The "Book" on A5's by Vanderlinden and Shirley shows many engraving patterns and styles that were in the FN records and sales information.
The "Bands" that you believe you see is actually wood, as the finger groove of the earliest A5 did not extend to the end of the forearm. I would contend that the art used in the catalogue shown by Researcher is actually illustrations of 12 ga. guns.
I have not seen an example of a 16 ga. gun that has this type of forearm, by 1909 the finger groove extended through the end of the forearm on both 12's and 16's.
Will
