Fellows: Do any of you out there have info on how to tell the age/time frame of a razor's manufacture? Are there grinds, blade shapes, handle shapes, markings or handle materials that can positively, however roughly, place a razor at a given time?

All I have heard is that hollow grinding did not become the rule until around 1870. I'm not certain of the vulcanite or celluloid origins. Isn't there a specific time frame for certain import markings such as "Germany" vs. "Made in Germany," for instance.

Grant