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.
Late-model (1960-1985) models, especially unpainted ones, have become less valuable due to decreased demand compared to newer models featuring improved details. These models still command a high price, often several times the original retail price.