Doulton & Watts. I have never seen a hunting jug marked Doulton & Watts.
|1860 - 1880?||1870 - 1890?||1882 - 1890?||1891 - 1901?||1880s||1890s|
|1902 -1922||1922 - 1956|
The use of the various marks may have overlapped hence the uncertainty. The first two marks are much more common than the third. Its use may have been cut short by the requirement to show the country of manufacture.
The last four marks (upper row) are uncommon.