Vintage McCoy rectangle planter, 1940s? Turquoise with leafy design

This is a beautiful McCoy planter is 9”L x 4.5” W x 2.5” H. 1940’s? There are a few glaze issues see photos of the top at the end and the bottom near one foot. This is older pottery and very good condition. There is also a white substance near the one end as shown in the photos please look at photos carefully.