1974, Sylvia O'Neill Dorn, https://books.google.com/books?id=pzI4AQAAIAAJ&q=%22disappearables%22&dq=%22disappearables%22&hl=en&sa=X&ved=0ahUKEwjp1O_MkODQAhVos1QKHS3tBdgQ6AEIPjAH The insider's guide to antiques, art, and collectibles
Be prepared to give a discount for special reasons. Watch your merchandise carefully since light fingers sometimes make salables into disappearables.