RARE - these two 3.25" butter pats are stamped with both Mayer China and Maddock & Miller Inc. New York City.  Maddock & Miller brought a lawsuit against Mayer China in the SDNY in the early 1960's - read about it here:

https://www.casemine.com/judgement/us/5914c89badd7b049347ebb6e

Most Mayer China is stamped Beaver Falls, Pa.  These are true collector pieces.  

Each butter pat has laurel leaves surrounding the dish.  Some fading on one section of one dish (see photo)