Yours appears to be a stem-wind (aka stem-set) movement, which started to become popular in the late 1850s. The invention of stem-wind movement did away with watch keys. The stem-wind/stem-set movement is the most common type among both vintage and modern pocket watches. So, the moral of my story is that your watch dates after the late 1850s to gosh only knows when, and without serial numbers or case numbers, and not knowing the manufacturer, it's impossible to date your relic. Very cool relic though! I like it!