The divided pot was so the hostess could offer her guests either tea from or China. Very elegant, yes?
Beside the Twinspout Tea Master make, Hall Tea company made a lot of teapots that look like this, although they were usually those were made without two chambers.
The last time I checked, this pot is worth around $200.00 because it is in perfect condition.
The spot on the foot is a kiln mark where the foot stuck to the shelf and therefore forgivable.
So once the pot is filled with tea, how do you tell which side has which tea?
There are very subtle 'touch and sight' clues that aren't apparent at first sight.
The handle has very slight ridges over one spout.
And you can barely see an impressed arrow on the left-hand galley pointing to one chamber. It is the chamber closest to the ridged side of the handle.
Also, you would think the lid would fit no matter which way you put it on. But it only fits one way. The clue is also a subtle arrow impressed into the claybody.
Next time you see one of these in an antiques store, check it out.