The Model F104 Unsaver is one of the rarest Model F keyboards ever released by IBM, and the ones that appear in the wild nowadays tend to go for extremely high prices ($2000+). Its layout is basically an F122 but with the numpad chopped off, making it very enticing for those who might want a lot of programmable keys without sacrificing desk space too much. As such, I believe it’s a keyboard worth considering if any new batches of model F keyboards are ever to be released in the foreseeable future.