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1820s ...I'm not sure.
Yes, framebacks were in using since about 1820s, but the tail of your razor doesn't look like that time.
But 1850s-1870s possibly. It was frameback's time.:)

I know this very informative website and saw the stamp there, but unfortunately, I'm not so friendly with French too, that's why I tried to look on your razor stamp more carefully.
The dates on this...

Korff & Honsberg, Remscheid, Germany is in business since 1930s till now.
Korff & Honsberg GmbH & Co. KG
Daniel-Schürmann-Str. 41
DE-42853 REMSCHEID
Nordrhein-Westfalen
Germany

Can you...