Kimball Swinger 500 "The Entertainer" organs were first introduced in 1972. The pricing given are rough estimations based on the limited information provided. Several important factors can influence the actual value, including the specific condition and features of the organ, as well as the current market demand. These organs come with a variety of features, including preset accompaniments, rhythm patterns, and solo voices, making them versatile for a wide range of musical styles. It's worth noting that the value can vary depending on the seller and the buyer, as well as regional differences in pricing. To obtain a more precise appraisal, it's advisable to consult with experts or online marketplaces specializing in musical instruments.