https://www.newportbrass.com/product/kimbell/polished-chrome/3-3424tr/
Kimbell - 3/4" Round Thermostatic Trim Plate with Handle - Polished Chrome - 3-3424TR | Newport...
Newport Brass carries the Kimbell 3-3424TR 3/4" Round Thermostatic Trim Plate with Handle and is available in a number of different finishes