I'm a carpenter it's my everyday work knife it takes a beating! The knife was scratched up so I etched it in ferric chloride. I splattered it with fingernail polish, then dipped it in the acid. Didn't take long, I kept checking it every 20 seconds or so. Then tumbled the blade in a ceramic media. It's different and doesn't show scratches! That M390 makes a awesome work knife holds a edge forever.How'd you get m390 to look like that? Quite the patina.
I picked the serial # for a purple 0609 for my wife, #0123Hard to believe they've made over 18k of those...
Mine's serial# 0123.