These are only available in brass, as the bronze case swap by Magrette never materialized.
And I would say it's more of a lovely brass tarnish than patina.
Chris from 10:10 did a great full tear down review of this movement.
http://www.rwg.bz/board/index.php?/topic/36061-Yuki-3135-Clone-teardown-and-review
Interesting. I am having a tough time just getting a gen LV insert into the bezel ring at all! Tried several time to get it to pop in completely, both with it on the case and after taking the ring off the case and no luck. Fingers really dis hurt after the attempt, but will try again soon. Hate to have to send it off to a modder just to put the gen LV insert into the ring...