I found this article on the difference between how chrome tanned and vegetable tanned leathers are made, which explains why some leathers have peculiar scents! I think I may be associating the vegetable tanned leather scent with the smell of "real leather."
Chrome Tanned Vs. Vegetable Tanned Leather, Explained
A deep dive into the differences between chrome and vegetable-tanned leather.
www.gentlemansgazette.com