Blisett, Thomas London and Liverpool
The Liverpool Blisetts are first recorded at 38 South Castle St. in 1834. In 1835, the address changes but they remain on South Castle St, where they are listed until 1870.
In 1900, the firm was at No. 36 South Castle St, but there is mention that they had a London address at 10 Water Lane between 1863 and 1864.
It is doubtful that your gun is an early one, but it could fall anywhere between 1834 and 1870.