Cast iron trivet made by J. Z. H. - John Zimmerman Harner, Union Manufacturing Co. of Boyertown, Pennsylvania. This company made a series of cast iron trivets from 1944 to 1958. Each was marked with a letter of the alphabet, the year and the initials “JZH.”
This trivet is 6" across and 2'' high. It has 3 rests on the top so you kettle or pot will not sit directly on the trivet, but about an inch above,
Condition is very good with slight vintage wear.