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KAI disposable straight razor
A pack of 5 goes for 100yen.
HHT like a champ, but I don't know if I'd ever actually use one to shave my face.
The cutting edge is ~50mm long, and it's 12mm wide (4/8 according to straight razor convention). Folded steel or aluminum that clamps the blade (hey, it's a frameback!;)) Very lightweight. I think I'd have to hold it by the flat part of the handle, as it is too narrow to hold it by the top and bottom of the "tang" as you would a normal straight.
Anyhow, interesting score.