Ink signature of Frederick Loew on an off-white 5 x 3 card; felt tip signature of Isaac Stern on a light blue card; ink signature of Vladimir Horowitz on an off-white 5 x 3 lightly-lined slip; and an ink signature of Julius Rontgen on an off-white clipped slip, affixed to a larger card. In very good overall condition. RRAuction COA.
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