Forgotten,
I am also interested in understanding why the trigger take down lever might be straw in color. From what I have read here, the use of straw colored parts was done away with in previous years on military Lugers.
Upon closer inspection, the stamped numbers look like they were mis-struck and could read "00" or "69" and the proof stamp is very much like those in 45 on the proof 4 page (wings in a trapazoidal configuration). The stampings could be an 89 as well since they are mis-struck and hard to read, but beacasue the lever is straw in color, should I suspect it is anything but "89"? For your convenience, I have copied the proof markings and attached the link below.
http://forums.lugerforum.com/lfupload/proof4.jpg
Thank you again in advance and I am looking forward to learning more.
Aaron