Cupboard, and shelf above the bathroom sink
Shower, (drain? hot water heater?)
Wood below rear window
Shelf on dinette side of closet
AC outlet beside furnace
, and by the door on the bathroom bulkhead.
above sink, and dinette (120 VAC?)
Bathroom bench is not original
Hand pump missing on sink, (water tank?)
No bathroom door
Just based on the fridge
, and the fact that the window in the door doesn't open, I would speculate that this is a 1979, or later.
The hammer is probably for the coupler. I have a similar one on my first 4500. It is kinda sticky.