I have the box from my own Diamond chain, this is its third season.
There is an American flag on the box and it’s marked Indianapolis.
I browsed around the Timken/Diamond website an bit and couldn’t find any sections for PowerSports chains, mainly industrial applications. I did see a section on XLO and duralube chains. This website wants you to make an account to dive into its site more deeply, and I did see J & P cycles, Tucker/Rocky as distributors.