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I'm not fully certain, but it seems to be 5/8 or 6/8. I'll measure it and post a picture once I get it back...I sent it out for honing.

I just bought one of these myself in at a little shop in Quakertown. Paid $12 for it. I'm so brand new to straight razor shaving that I haven't even tried it yet. I figured I'd find a decent...