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This thread is probably the best source of info on Packwood razors on the web now. Fascinating.

Lots of interesting info here, thank you gentlemen.

I found a larger version of the graphic that martin kindly posted. I looks like mine is about 1810.
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Picked this one up recently for a good price. It had heavy buildup on the blade, this is after the initial cleanup. PACKWOOD is the only marking on this.

I believe this may be an earlier model....