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I'd venture second quarter of the 19th century

Yes, that's the early 1800s kind of blade I was refering to.

To provide an example of seemingly the same period as your W&B, there's this one for example
316800

316801

It's true for post 1900 razors.
And at the same time it's almost always wrong with 1800-1810 razors.

You also have to consider that almost all 19th century razors are forged with a smile.

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