It looks a lot like either an:
- Antique Brunswick Balke Collender Regent
- Antique Brunswick Balke Collender Regina
...but, the design pattern on the legs isn't identical.
They were an extremely popular design and model for Brunswick.
Yours may just be a variation on that model, or it could also be a knocked off version by other pool table makers.
It would be helpful to have a few additional pictures.
Also, are those a matching set of interchangeable carom rails in the background?
Either way, the era is most likely between 1915 and 1925, when the Regina and Regent pool table models were produced by Brunswick.
Here is a 1915 Brunswick Regina from the catalog:
Here is a 1915 Brunswick Regent from the catalog:
Though these photos show the carom versions, they were available in the pocket billiards version, as well as in a combination, with interchangeable rails.