Citizen vintage Japanese art deco watch

Yellow gold (plated, I assume) Citizen watch. Serial #9031730. Needs new battery. Otherwise good condition. Belonged to my great aunt. Pretty delicate and small (see photo next to my Apple Watch for size example). See pix of front and back. The inside of strap shows wear (see last pix). Back is marked Japan. Not a clue what original cost but another seller here has same model for sale for $390 except hers may be newer.