George 15625 was likely made in in Sep-Oct 1868. It's the only Reilly 4 bore in the chronological list of Serial Numbers.George: your gun was one of the first I ran across when I started looking at Reilly. I posted this in the Chronological list of SN's in the long EM Reilly History Chronology, Serial Number line:
15625 - (1868)
Name: E.M. REILLY 502 NEW OXFORD STREET LONDON Branch Establishment 2 Rue Scribe Paris
Descriptions: 4 bore SxS cased hammer gun SN 15625 converted by the company in the eighteen hundreds from the original pinfire to centerfire.
Comment: George’s gun and George himself was subject to some painful back and forth-ing on DBS when he first posted the gun, typical of the internet. I firmly dated as being numbered sometime in Sep-Oct 1868.
http://www.mylandco.com/index.php?pageid=4And I posted the analysis on the long EM Reilly line. I dated it as having been numbered in Fall 1868, possibly September or October.
-- Reilly opened Rue Scribe Feb 1868
-- First SN I've found with Rue Scribe on the Rib is 15270
-- He was numbering about 50 guns a month at the time.
-- Your gun SN is 355 numbers higher than 15270
-- 50 a month after Feb 1868 = 7 months
-- Voila Sep-Oct 1868
1st Rue Scribe gun................................................................................................ 1st Reilly Martini
Febv1868..............Janv1869..............Janv1870...............Janv1871...............Janv1872.......1872
..15270..........
v.....15750.................16250...................16750...................17250..........17644 - (at 500/year).
...................
15625 ...............
Sep.Oct 1868By the way, it's the only 4 bore in the chronological database. But Reilly numbered over 35,000 guns before the firm dwindled away in he early 1900's. I've only collected SN's and info on about 200.