I'll post a portion of the SN dating line re 15129 from DGS. Whole shebang can be read there,,,,check at the end of page 9 for the most clear explanation of dates:
http://www.doublegunshop.com/forums/...=436538&page=9
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1862 - Feb 1868[/color]: 13300 - 15250 [color:#3366FF] London exhibition. From SN 13333 firmly identified as 1862 to 15270 firmly identified as Feb 1868, he numbered almost 2,000 guns. About 340/year. 27/month.[/color]
[color:#FF0000]13333[/color] - E.M. Reilly & Co. 502 New Oxford St., London; .577 cal. Rifle; percussion breech loader, [color:#FF0000]Green Bros patent 1862 firm date[/color].
13590 - E.M Reilly & Co., 502 New Oxford Street, London. 10 bore; Rifle SxS; Percussion hammer gun muzzle loader.
13599 - E.M. Reilly, 502 New Oxford Street, London. 12 bore; Rifle SxS; 2 groove Percussion double express Hammer gun, muzzle loader.
14115 - E.M. Reilly (nothing further - no photos, etc). Shotgun SxS; Center break, Jones under leaver, hammer gun.
14580 - E.M. Reilly & Co. London. 12 ga. Shotgun SxS; Percussion hammergun, Muzzle loader.
[color:#CC33CC]1866:[/color]: 14540?-14900? [color:#3366FF]1866 British army formally adopted the .577 Snider Enfield as a stop-gap breech loading rifle. Reilly built Sniders and converted some Muzzle-loading Enfields to the Snider action. Any Reilly Snider should be 1866 or later. However, unless he built them to measure, he did not seem to number them. [/color]
[color:#CC33CC]1867[/color]: 14900?-15240? [color:#3366FF]Huge Reilly success at Paris exhibition that summer; Gold medals appear on labels; [/color]
14985 - E.M. Reilly & Co., Oxford Street, London. 16 ga. Shotgun SxS; Sidelock, underlever hammer gun, (Buffum).
15129 - E.M. Reilly & Co., 502 Oxford St. London. 12 bore. Shotgun SxS; pinfire, hammer gun, muzzle loader.
15143 - E.M. Reilly & Co, 502 Oxford St. London, 12ga. Shotgun SxS; underlever, hammergun.
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Feb 1868 - Aug 1886:[/color] 15270-27340? [color:#3366FF]In Feb 1868 he opened Rue Scribe, Paris. Many of his guns subsequently had the Paris address. 15270 is the first gun with Rue Scribe. He closed it in Late 1886. 27340 is the last gun with Rue Scribe. [/color] [color:#FF0000]Note: Internet "urban legend" has him closing Rue Scribe in 1872 including one author of an article in DGJ. A glance at ads and gun ribs below show this is just poor scholarship. [/color][color:#3366FF]18.5 years. 222 mos. 12,100 guns. = about 55/mo. 660/yr. (this is a guess estimate but a good one).
There are some guns early on in the 1868-86 series that perhaps should be later in the date series - I'm thinking of the 1871 Martini Henry which seems a bit early for him to have produced and the 1873 gun that has a Needham’s Patent 18547 (which may or may not be C1874). This would indicate a production of fewer guns early on and more later.
This is a long stretch of time; The only way to narrow down the year dates is to check patents on the guns. If people look inside their Reilly's which have SN's during this period, would appreciate info on these patents - use of which (not non-use) could alter the above chronology - And I'm already thinking of altering the chronology a bit to allow for fewer guns produced early in the period and more at the end):
1872 - Patent: Anson's fore-end fastener patent no. 3791
1874 - Patent: Needham patented a hammerless, barrel-cocking gun which was also the first ejector in 1874.
1875 - Patent: W.M. Scott's patent 3223
1875 - Patent: Anson & Deely patent; the first hammerless gun with top lever.
1878 - Patent: Mills 3rd bite patent no 4980
1878 - Patent: Patent Number 761 was recorded by William Middleditch Scott and Thomas Baker
Feb 1868-Jan 1869: 15250-15800
15270 - E.M. Reilly and Company Oxford Street London & Rue Scribe Paris. .577. Rifle SxS; Underlever. BPE. Non-rebounding hammers.
15283 - E.M. Reilly & Co., Oxford Street, London. 12ga. Shotgun SxS; Jones under lever. Buffum.
15346 - E.M. Reilly (no further info). 12ga. Shotgun SxS; Under lever, hammer gun.
15531 - “Reilly & Co. (no address mentioned). .50cal. Rifle Single barrel. Enfield type. Hammer gun. Muzzle loader. Buffum .
15625 - E.M. Reilly, 502 New Oxford Street, London, 2 Rue Scribe Paris. 4bore. Shotgun SxS. Underlever. Orig pinfire conv-to centerfire.
1869: 15800-16460
15857 - E.M. Reilly, 502 Oxford Street, London. 12ga. Shotgun SxS. Centerbreak, underlever. Non-rebound hammers.
15961 - E.M. Reilly (no further descriptions). 12bore. Rifle SxS; Centerbreak, Underlever Hammergun.
16341 - E.M. Reilly (No further descriptions). .577cal. Rifle, Snider SxS. Jones underlever; hammer gun(Weiland). First rebounding hammers (1867 patent)