Previously a Holt's auction advertisement for a Reilly .410 SxS was posted here with comments on the three other similar guns in existence.
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=666407#Post666407

In this regard here is once again Holt's putting up for sale SN 12251 (1862), a Reilly SxS cape gun muzzle loader. Reilly was one of the very first London gun makers to advertise this type of gun. There are 5 such muzzle loaders known to still be extant. Nice gun:
https://www.holtsauctioneers.com/as...+++534+&refno=++226376&saletype=
E.M. REILLY & CO., LONDON
A GOOD 25-BORE/.500 PERCUSSION CAPE-RIFLE, serial no. 12251,
for 1859, with expertly re-browned 30in. twist barrels the broad matted raised top-rib signed 'E.M. REILLY & Co. OXFORD ST. LONDON' within an arabesque white metal lined bordered panel, the top-rib also bordered with a white metal line and marked with similarly bordered one inch increments, dove-tailed bead fore-sight, 'Africa' style rear-sight with five flush folding notched leaves, each with platinum central line and a further shallow standing notch, shell engraved rib-end at breech, platinum plugs, borderline and scroll engraved elongated top-tang, borderline and scroll engraved bar-action locks signed 'E.M. REILLY & Co.', engraved hammers, chequered walnut pistol-grip half-stock (chequering worn smooth), engraved hinged patchbox to right side of butt, iron heel-plate, engraved moulded iron grip-cap, engraved iron trigger-guard tang and bow, single set triggers for both barrels, engraved ramrod throat, plain thimbles and nickel mounted iron ramrod (small pinned working repair behind right hand lock)

[Linked Image from i.imgur.com]

Baluch are not Brahui, Brahui are Baluch