I hate to disagree () but on my Dovo best quality the flat side is the machined pin and it is on the front - the side with the Dovo Stamp and the blade etching/frosting.

The back side has rounded pins and you can clearly see the washer. (It looks like the second photo Ben posted, except it's a little rounder.)

Now that I look that closely, the pivot pin has TWO washers on the back side and none on the front. That might have been a mistake, but who knows...

Edit: I don't know if I'm disagreeing with anyone, actually...