According to the anecdotal data, the Doan uses a better glue on the ferro rod. Based on my own observation, I would say that they aren't quite the same chemically- the oxidation layer is thicker and a lighter grey on the Coghlans, and it seems to be a little softer.
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-IronRaven

When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.