Lew - I am probably telling you something you already know. Forgive me if I am. I don’t have the 1913 Eley catalog or the 1914-15 catalog for which you show the cover. However, I do have the Price List for Eley Brothers Ltd. for February 1st, 1914, which shows the trademark in question - the “E” in a square, over another tilted square with little “E’s” in the corners.
Do not assume that a cartridge called “9mm Automatic” in these catalogs is the 9mm Parabellum. It is not. It is the 9mm Browning Long cartridge. In the British catalogs, that is the way that caliber is identified. 9mm Parabellum is clearly identified as such - “9mm Parabellum” and is not shown at all in my 1914 Price list.
Am not trying to read into what you are doing. That may not have been the point of your inquiry at all and I realize that. Just a caution.
Unfortunately, my next Eley Catalog is a reprint done in South Africa, and they did not reproduce the cover of the catalog, a big mistake in my opinion.
By the way, the logo in question does not appear anywhere in the 1910 Eley price list No. 83 (mine is, however, a reprint, but I assume that it is an accurate copy of the original).
Some other thoughts. The 9mm Para cartridge is not on my Eley cartridge board, which is circa 1914. In the book “Eley Cartridges,” by C. W. Harding, Appendix E, “A list of metallic cartridges produced by Eley Bros. extracted from their catalogues between 1885 and 1919” the 9mm Para cartridge is not shown. The catalogs used in that were (I have not bothered to identify the early ones before the existence of the 9mm cartridge)…1901, 1902, 1904, 1905, 1906, 1907/08, 1908/09, 1910/11, 1912/13, 1914/15 and 1919. By 1924, all metallic cartridge production had moved to Kynoch Ltd.
In Appendix A of the above book, “List of cartridges in metallic loading book upon closure of Eley Brothers Ltd. Factory in London,” the 9mm Parabellum cartridge is shown in two loadings, although the loadings are not described. Unfortunately, without reading the entire book, I have not been able to find the date the London factory closed. Perhaps Tony or John P-C can supply that. The book has a remarkably poor table of contents. I cannot find a closure date in any of my other Eley references, some published by Eley, either. If we assume that the London factory was closed circa 1924-1926 and that the catalog listings mentioned in Appendix E are correct (no 9mm Para listed up to 1919), then the Eley 9mm Para round should date from between about 1920 and 1924. The 9mm box in question shows “Eley Brothers, Limited, London” as the address.
One other point - there probably were not a lot of 9mm Parabellum caliber pistols in England until WWI supplied a quantity of souvenir pistols of that caliber. the Eley headstamp is a commercial form of marking, and probably they would not have produced commercial pistol ammunition, especially for a caliber new to their production, during WWI. That would lead one to believe that the 9mm para production by Eley began after the cessation of hostilities in November 1918. That is, if the ammunition was not made before WWI, and again, no record seems to exist for that, or at least no price list or catalog references.
It sure would be nice to see an Eley factory drawing for this cartridge. We have several Kynoch drawings.
Of course, that is one heck of a lot of assumptions. All just food for thought, nothing more.