I don't know why but I find this gun fascinating, Cracked and repaired stock and all. 13155 would be late 1863 per my chart. On big bore rifles Reilly usually used a pistol grip stock or a trigger guard extension aping a pistol grip...nothing here though which is maybe why the stock cracked (and maybe why Reilly ditched the trigger guard extension). There's something almost primordial (young peoples' term would be "organic") about shooting one of these. I assume the 14 bore is the shotgun and the 20 bore the rifle? Holt's does not do a great job of providing information on their guns:
https://auctions.holtsauctioneers.c...++2049+&refno=++160145&saletype=

A 14-BORE & 20-BORE PERCUSSION DOUBLE-BARRELLED CAPE-RIFLE SIGNED E.M. REILLY, LONDON, serial no. 13155, circa 1860, with browned 29 1/2in. barrels (rear-sight and one nipple absent), scroll engraved bar-action locks, walnut half-stock with professional plated repair at wrist and mahogany ramrod
Estimate £500-700
[Linked Image from jpgbox.com]