I am assuming that it is a three-speed with a Sturmey-Archer hub. The manufacture date of the hub will be stamped on the hub. You can assume that the bike was made pretty close to that year.

I believe Robin Hood was made by Raleigh. Robing Hood was made in Nottingham, England. Nottingham must have been quite the bicycle hub back it the day because Hercules was made there too. Can you imagine being in Nottingham, England back in the bicycle heyday with all those townspeople being employed by thriving bicycle manufacturing companies. It must have been grand.