From the eBay listing for the Airway Suspenders display automaton:
Up for auction is this very amusing, 19 1/2" tall X 13 1/2" wide, electrical automaton figural advertising display rack & unit. The composition man rocks/sways slowly from side to side while the cloth elastic & leather suspenders practically stay in place. The base in made of oak and the mechanical unit is in fully-functional condition. The man has had an old restoration to the neck area, but it was extremely well executed. The unit seems to date from the 1940s or '50s.
The eBay listing has many large pictures showing all angles of the automaton including the motor assembly.
Here the link to the Airway Suspenders advertising display automaton.