I was inspired by your search for a replacement strap for your GO, Art, and went to find one of my own.
It was more difficult than I thought, since some cordovan straps are only so on the outside, with an inner lining
of calf (not my preference).
At first blush this strap was a bit stiff and plasticky, but it softened up fairly quickly and burnished to a nice surface appearance.
Looks like it will wear like iron.