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Yep, I think these are quite seldom. Have only seen two of them the last maybe 5 years on the japanese vintage razor market.
The stamp itself is shown in a picture with a stamp box of Kanayama...

Here are some older strops with beautiful and less seen top stamps:

341354

Regards Peter

Great idea!
So here is my combination of two great masters in japanese handcraft: Yukio Kamijou and Naomi san- Kanayama

341077

どうも有難う御座いました

Domo arigato gozaimashita Naomi-san !

Regards...