Your Lewyt has the original hose, which is very rare. That means, it has three wands, one curved, and two straight. The model 40 was Lewyt's first vacuum cleaner. They stole the design from Health-Mor Inc. of Chicago, it was a fairly poor copy of the Filter Queen. Health-Mor sued Lewyt and won enough money to build their own factory and eliminate Royal as the manufacturer of the Filter Queen. The court ruled in 1953 that the model 40 and 44 Lewyts were in violation of patents held by Health-Mor and gave Health-Mor a huge settlement.
Lewyt took out the filter cone and cyclonic dirt separation, and put in a bag. It was the beginning of the end for Lewyt.
The manufacturing date of the motor is stamped into the bearing bridge, which you can see when you remove the exhaust cap and look.