Antique porcelain rolling wheel Sengbusch desk stamp moistener / inker, large & small

Two vintage inkers or stamp moisteners, both heavy white ironstone porcelain with rolling wheel. Both of these are in nice clean condition.

The large one is marked Sengbusch Self Closing Inks Stand - Ideal Moistener. It's wheel measures 2" wide and almost 3" in diameter.

The small one is marked Junior Moistener on the bottom of the stand. It's wheel measures 1 1/4" wide and about 1 1/2" in diameter.