I've had this one for a while, and it shaves brilliantly, but I want to know more about its history. Here it is:

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It's stamped with LISBON, which is a known stamp of Thomas Warburton:

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But it's not quite the same stamp:

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And upon further investigation, there is a very faint etching along the spine that reads:

'Wm. Warburton's best German Steel'

You can sort of make out 'Wm' here:

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I'm assuming German Steel refers to a type of blister steel that Germany was a large exporter of at the time, but I can't find much on William Warburton or his use of the Lisbon stamp. I'm assuming this razor predates Thomas (I could be wrong, but it just looks very early compared to the time (or after) Gales and Martin was published, and I can't imagine a William and a Thomas Warburton using the same mark at the same time). So, Martin or Neil - can you dig up anything?