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Joined: Nov 2000
Those knuckles are rolled, not extruded or milled from solid.
You might choose to fabricate your own hinge. I know that isn't a particularly attractive alternative, but those look rather rare. Alternately, you could inquire about custom manufacture. I believe Horton Brass will fabricate things upon request. Somebody will anyway, but without doubt, that will cost a lot. That's why I suggest fabricating them yourself, and that's why I used that language. You notice, I didn't say, "You will enjoy fabricating them yourself."
Obviously, another alternative is to choose another type of hinge. If you're determined to have those, and you find a vendor, let forum members know.
I also think you might try antique/junk shops. It's a long shot, but there is usually a vendor in that marketplace the scrounges and sells old, unwanted hardware from furniture and fixtures. Expect little, that is a very long shot.
Good luck.