Mid-run (1960-1985) models, in particular unpainted models, have appeared to drop in value lately, as they are becoming less desirable in comparison with newer models with much better details. These models still often sell for several times the original suggested retail price.
Models from the middle era (1960-1985), particularly those that are not painted, have lost value over time as they are no longer considered as desirable as newer models with more advanced features. However, these models still sell for a premium, often several times their original retail price.