Marvelous set ! The brush itself is amazing.

The razor is IMO english, around 1760-1790, with a very nice set of decorated tortoise scales. You can usually see some of these razors in 7-day set with hone, comb, in huge shagreen boxes. :-)

examples :

https://sharprazorpalace.com/show-te...um-london.html

You should ask Voidmonster or Scienceguy, they probably will tell you a lot more about the razor / maker, and should be able to give you a more precise datation.