They made those for a few years before discontinuing it around end of 2011. Taking a guess they were made between 2008-2011. They were made under the second most recent ownership group but while they are seemingly Filson durable, they didn't sell very well.
With you on that- hopefully they'll be re-uping more colors before too long, hoping for the indigo and copper. i know we'll see that blacktint green in the chinos, i think those will look much better on the 60/30s than the Slims.
you'll straight those out quickly as you carry it with weight and add your own little wrinkles and imperfections. my handles smoothed out quickly and are now distinctive. the more personal marks, the better.