Best carbon steel production folders? Well, I've used some from Case (chrome vanadium) and the German big two that were pretty good. But, I'd have to go with Oldtimer. Yeah, the scales are genuine Delrin, and they don't open and close smooth as butter, but as a cutting tool they would be hard to beat. They take and hold a sharp edge. Their blades aren't paper thin. They resharpen without much fuss. And they are about as delicate as an anvil. IMHO I'd say Puma, Boker, or Case for show, Oldtimer to go.
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Dave
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If at first you don't succeed, go buy a knife.