Featherweight value is highly dependent on cosmetic condition. "Mint" condition with the decals and finish all perfect is the best, of course. Year does not matter much; condition matters a lot.
Many machines have had their scroll faces switched out (the earlier, fancy ones getting taken off machines in poor condition and put on later machines in good condition to increase their value). The elaborate scrolls are worth more money.
You have to decide on the importance of cosmetic condition vs working condition to you in relation to cost. Working featherweights in poor cosmetic condition will cost considerably less than those in mint condition.