Hi Uwe
I think one of the possible reasons why the description is the same could be because Mericka ("Orders and Decorations", London: Paul Hamlyn, 1969) borrowed it from Gritzner (please correct me if I am wrong).
James firmly believe in Shahs firman that was issued in 1872 (James translation from French could be found here http://web.archive.org/web/20050304091119/http://www.4dw.net/royalark/Persia/Orders/lionsun4.htm)
Everything that is not in accordance with this firman is "replacement" made by dilettante dealers for such unintelligent persons like me.
The problem is that we don't have firman color discription for Arts&Science order ribbon (at least I don't have this description )
Another problem - all L&S orders that we see nowadays have green ribbons (including standing lion versions). And if they all "replacements", then why dilettante dealers (as we know - they read Gritzner ) replace all blue, red and white ribbons. And then again - many of these green ribbons are looking good (at least they are old enough to be authentic).
Only orders of Arts&Science have red ribbons and some medals (issued before 1925) of this order have red ribbons also.
Well, maybe in some point between 1872 and 1925 another regulation was adopted? Just a thought...
Cheers,
Nick