Anytime untanned leather is exposed to the elements, be it sun, rain, etc., it will darken, imo a much more natural shade than when chemicals are applied. One of the best examples of this is "make it Jones" if you guys are living in the UK or Europe, this may be a good source for you as well?
Here is a link:
https://sites.google.com/site/makeitjon ... ip-holders" onclick="window.open(this.href);return false;
discussing various shades of the leather as requested. He sent me a strap that is the most supple I have yet to handle. Made by a fan for fans.
Todd still sources a good strap. WPG sells one as well. Sometimes, the question is grooves vs. no grooves. Then a buyer can hone in on the vender of preference.