Imperial yellow ground porcelain plate with 5- claw green dragons on the underside. It has a 6-character Daoguang mark on the base and is of the period.
Dimensions are 1 1/2 inches tall X 7 1/4 inches wide. All measurements are approximate.

From a Des Moines, Iowa estate. Grandfather lived in China in the early 1900s.
High resolution images can be found at: https://file.ac/MEkH3Yzhz4U/. Secondary pictures are raw and unedited and were taken with an ipad.

There are multiple cracks along the rim.