This is all Holt's had to say about the gun-

"J. & W. TOLLEY
A 10-BORE (2 5/8IN.) 'UBIQUE' DOUBLE-BARRELLED ROTARY-UNDERLEVER SHOT AND BALL HAMMERGUN, serial no. 6916,
32 1/4in. damascus barrels with broad rib engraved 'J. & W. TOLLEY. MAKERS. 1. CONDUIT STREET. ST. REGENT ST. LONDON. W.' and inscribed 'UBIQUE' in gothic script at the breech-end, bead fore-sight, rear-sight of two folding leaves calibrated up to 100 yards, Jones patent rotary-underlever, carved percussion fences, rebounding back-action locks, border engraving, locks retaining very slight traces of original colour-hardening and finish, the action body brushed bright, 14 1/2in. stock (cracked through at hand) with steel buttplate "

Cheers
Tinker