Go to this site and scroll down to find a Sheraton tall case clock of the same vintage as yours.

https://www.liveauctioneers.com/item/62289112_antique-sheraton-mahogany-tall-case-clock

The sample in the above web page may not be in running condition. Its price estimate is $700 to $900 with a starting bid of $350. These prices are in the ball park for this clock. In today's market, If the clock does not run but all the pieces are there and none broken, it is worth at about $400; fully restored, $900. However, your clock does have 2 complications ( added features). There are 2 extra dials on the face. This increases value. The face of your clock is in very good condition - adds value. All 4 hands are there and appear to be originals - added value. The decoration surrounding the face is better than average - value adder. The top decoration of the case is in very good condition - value added. These are often damaged or missing. The cases for Sheratons of this vintage is mahogany and mahogany veneer.

The weights of your clock appear crude and may be originals. This appearance is proper for this clock as the weights are hidden as well as the pendulum. A more fancy clock would have a glassed door exposing the pendulum and weights to view in which case, these parts would have been dressed up at added cost. This addition (and cost) did not enhance the time keeping ability of the clock.

It was desirable to observe the pendulum so that one could readily tell if the clock was running. The pendulum of your clock is hidden, but there is a second hand on the clock face that serves as a visual indicator.

Presumably, the pendulum is not temperature compensated, therefore, the speed of the clock will vary with temperature. It slows when warmer. Owners might have made adjustments to the pendulum twice a year.

The overall finish of the case is not damaged. therefore I advise leaving it alone. Small color changes due to aging is fine and may be desirable. There are some chips to the veneer at the bottom edge of the case. These can be repaired by gluing in color matched chips.

Before you put money into this clock, you should inspect the condition of the clock works. It is best if this inspection is done by a clock expert (unless you are capable of it). At this time, the repairman can give you an estimate of cost of repair. Expected wear points are the pinion holes in the brass frame. Usually, the gear shafts are much harder than the brass frame and most of the wear will be enlarged holes. A certified clock repairman can repair these holes by installing bushings and straightening and bent shafts. This should not harm its antique value since this was a common maintenance item a century ago. A repairman may take the works apart, install bushings where needed, soak the parts in a cleaning fluid, rinse the parts and dunk into a stop bath to neutralize any residual cleaning agent, reassemble the works and lubricate. After this, the works should be good for another 50 years with lubricating as necessary. (Lubricant should be applied only at the shaft bearing holes and no where else. There should be a small recess around the shaft hole. This is the oil pocket. Do not over fill. Oil will stay in this recess by surface tension.)

I would expect that the value of your clock when fully functional is in the neighborhood of $1000 to $1200. Unfortunately, the market at this time for these grand old clocks is poor and its hard to get full value. In my opinion, your clock when fully restored is worth much more than $1200. Buyers are looking for a bargain and will pass it up if they don't get it. If it were my clock, I'd keep it.

By the way, these days mahogany wood is very expensive. Wood working shops do not keep a supply. They order the lumber only when needed.