(04-13-2021, 11:08 AM)riverrun Wrote: Then there is Sept 28, 1905.
This is not a valid US patent date and I checked all non-US patents I could find, that were issued on that date.
None of them is for a razor.
I figured out the mystery patent.
Sept 28, 1905 was the day the 1906 patent application was originally filed.
It's the same patent.
I don't think I've ever seen a filing date imprinted on a razor before.
Mystery solved.

