Appreciate the acknowledgement of the effort to help ed.
It's a utility grade percussion double, of interest because of the gauge, by a (likely) known but not 'Belgian Best' maker, intended for export in light of the 'REAL TWIST' barrels, that may have a cracked stock.
Probably not a museum candidate.

[Linked Image from photos.smugmug.com]

[Linked Image from photos.smugmug.com]