In a large bowl, whisk eggs, milk and butter. Add flour and mix well. Refrigerate, covered, 1 hour.
Preheat oven to 350°. Heat a lightly greased 8-in. nonstick skillet over medium heat. Stir batter. Fill a 1/4-cup measure halfway with batter; pour into center of pan. Quickly lift and tilt pan to coat bottom evenly. Cook until top appears dry; turn crepe over and cook until bottom is cooked, 15-20 seconds longer. Remove to a wire rack. Repeat with remaining batter, greasing pan as needed. When cool, stack crepes between pieces of waxed paper or paper towels.
Place a slice of ham on each crepe; roll up. Arrange in 2 greased 13x9-in. baking dishes. Bake, uncovered, until heated through, 8-10 minutes.
Meanwhile, drain apricots, reserving syrup. Cut apricots into 1/4-in. slices; set aside. In a large saucepan, combine sugar, cornstarch and salt. Whisk in apricot nectar and reserved syrup until smooth. Bring to a boil over medium heat; cook and stir until thickened, 1-2 minutes. Remove from the heat; stir in butter, lemon juice and apricot slices. Serve with crepes.