Southam's has added additional pictures of the 28 bore. Normally a Reilly SN is found on the tang, water-table, barrels and on the fore-arm. This SN 24716 is found on the tang, nothing on the action-flats, but there is what appears to be the sn on a flange of the lump ("716"can be discerned)., There is 'BNP" under a crown on the water-table. Not sure who this is.

[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]