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Preheat broiler to high and place oven rack at least 10 inches from the heat source.
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In a medium bowl whisk together mayonnaise, ketchup, capers, relish, lemon juice and old bay until smooth. Keep refrigerated until ready to assemble the sandwiches.
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Spread butter on one side of each slice of sourdough. Heat a large oven proof skillet over medium heat and place slices of bread, butter side down.
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Spread Maryland-style Russian Dressing evenly on each slice and top with a crab cakes, tomatoes, cheddar and swiss.
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Toast bread for 2 minutes on the stove and place sandwiches under the broiler. Broil for 4-5 minutes or until cheese is bubbly and melted. Serve warm.