The late 1962 lunar module concept. This one is my personal favorite.
The accompanying sign reads
First proposed Lunar Module, late 1962. This early LM concept featured five
fixed legs, large helicopter-like windows and, in the front, a second heavy
round docking hatch. It had no ladder.
Picture 2 of 2.
I have additional pictures of this
concept model at the National Air &
Space Museum, and additional information about this concept on my lunar module evolution