[Alexander]

Dear friends. The naval British dirk, the period of 1786-1800 has got to me. I would like to ask your opinion.
1. Whether had this dirk model of year?
2. This London or Birmingham manufacture?
3. Whether correctly I have written a date of issue (1786-1800)?
4. From and till time it was adopted at the British fleet?
I apologize for my bad English. Respect, Alexander. (Moscow).