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I am new to razor history, but I noticed this Gillette blade marked with 250 and noted as being made about 1910. Could that low number possibly be from a few years earlier? I would be curious to know how you decipher the blade number year estimate. I have been interested in this story ever since I found out that Gillette worked where my Father use to work (William Painter’s Company, CC&S). I’d appreciate any info on figuring out the dating of these blades. Thank you.