Leitz Focomat 1a developer.

Hello. I have acquired this Leitz Focomat 1a developer, circa 1937? It has an Ernst Leitz 5 cm/3.5 lens. Other than than I know nothing of it's history or value. It seems to be in good condition with only the electrical cord needing replacement. My father also had a developing tank and chemicals along with associated items, some of which are what I believe to be accompanying this developer on the floor. Brand Vivitar. If anyone can give me information on probable value or any pertinent history on this piece, I would appreciate it.

Thank you,

baharper14@gmail.com