So I would guess you have a mouth blown bottle. It would have been blown into a mold that included a rough finish, and then when removed from the mold the finish was tooled with a hand held device to create the correct shape and smoothness.
The technique predates even semi automatic bottle machines. These were taking off at the turn of the century. However, there is nothing to say someone was not continuing to use this technique well after the machines were invented.
My guess would be early 20th.
