vintage electric warmer for buffet, old Williamsburg cast iron trivet

Working 'Williamsburg food warmer', a small electric hot plate in a cast iron trivet in an antique reproduction style. This is nice and clean, no box, but never used.

It's 2 3/4" across the warmer plate, and about 5 1/2" overall diameter, large enough for a big casserole or chafing dish.