Monax Petalware cake plate by MacBeth-Evans. Monax is a name given to this white color by MacBeth-Evans and Petalware was produced from 1930 to 1940. The cake plate or salver is 10 1/2" and has a plain base on underside rather than the concentric circles found on some of the other Petalware pieces. This lovely plate is in excellent condition with relatively no use marks.