For your consideration, I have an Antique Dueber Silverine 18S 3 Oz. 57mm Key Wind Pocket Watch Case.  This is in good condition and snaps together nicely on both sides.  It is measures 2-1/4" diameter and is 2-3/4" from top to bottom.  I have not tried to clean or polish this.  This comes from a smoke free home.  I will be listing several vintage items so check out my other listings as I will combine shipping on multiple sales.