Moore & Giles uses leather tanned in Italy. On a recent trip to their tannery they made this fantastic video featuring each step of their leather making process. What I found particularly interesting is the modern equipment featured in the film compared to some other renowned tanneries such as Horween that seem like not much has changed for a hundred years.
Source: https://www.mooreandgiles.com/resources/how-leather-is-made/
Included for comparison; this video by Trunk Club of the Horween facility.