This is not the right thread to ask this but to answer your question. The caseback is definetely not correct so it may be recased. Furthermore the dial is most likely redone.
Recently emailed UG regarding a part that I needed for a 1940s Tri-compax and they replied asking I send in the watch for an overhaul. I was surprised and specifically asked if they were servicing older watches, and they replied “of course”…. Thoughts?