Benchmade used Nylatron (spelled Nylon) washers in many models over time. Upgrading to the PB versions is something they do by request when sent up for LifeSharp services. Now, your 635 is a beauty as is...congrats! :thumbup:
My new addition. Super excited to get one of these.
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Random note: This one didn't come with bronze washers! IDK if that's common, but I thought BM used bronze washers in all of their knives. I could be mistaken, but I expected it to be smoother than it was when I first got it, I cleaned and lubed it and noticed the washers were different. It is still probably my favorite benchmade. Love the size, shape, looks, materials, everything about it.