Bastet was a Dutch manufacturer of high quality cutlery and surgical supplies since 1684, located in central Amsterdam.
They went out of business only in 1981, at some point changed the name to T.F. Bastet (around the last quarter of the 19th century), having been purveyor to the royal household for different periods of time (at least during the late 17th and late 19th century). I have one too (being Dutch I had to get one of course), it came in a box signed with "T.F. Bastet, The Dutch - English Razor" which led me to believe they might actually had at least some of their razors made in Sheffield.
Here is another one, as well as
here.
Based on the slighty bulky, unbalanced design and the tail design I'd place yours at the early-to-mid 19th century.