By 1900, snow globes were affordable and were popular souvenirs at sites throughout Europe. European manufacturers began exporting snow globes to the United States in the 1920s. Snow globes were first made here in 1929. The dial is discolored, but the rest of the clock is in good working condition. Repainting a clock dial lowers the value of the clock by about 10 percent.
Most collectors prefer a stained original face to a clean repainted face.
You live with your clock, and if the look annoys you, perhaps you can even get a new, clean dial to replace the old one. But save the old dial for the next owner.