It's actually Equus' burgundy but it's not a traditional burgundy with a lot of red. As you mentioned, it's closer to dark brown with a subtle burgundy tone and it is close enough for me.
Shown with a variety of shoes that I wear it with.
AE Tresana in cabernet brown
Alden color 8 shell
AE burgundy shell
Alden cigar shell
Equus is a joy to work with and I couldn't recommend their products enough. I now have three Equus belts.