Here it is again, rate of twist 1:75".

Gibbs Hunter, Rifles Gibbs (1865) - Davide Pedersoli
www.davide-pedersoli.com
Caliber .72 Grooves 6. mm, inches. Twist, 1:75. Barrel's length, 740, 29 1/8. Overall length, 1.150, 45 5/16. kg, lbs. Weight, 4,200, 9.25.

It looks quite nice, but the lack of a rod is a bit of a bummer.