Trim crusts from bread. (Discard or save for another use.) In a medium bowl, combine chicken, soup, gravy, water chestnuts, pimientos, onions, salt and pepper. Spread on 12 slices of bread; top with remaining bread. Wrap each in foil and freeze.
To Prepare Frozen Sandwiches: In a shallow bowl, beat eggs and milk. Unwrap sandwiches; dip frozen sandwiches in egg mixture and then in potato chips.
Place on greased baking sheets. Bake at 325° for 50-60 minutes or until golden brown.
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