Nice find Brian! The 63 was manufactured about 1953 if my memory serves me correctly. The 1961 stamp on the bottom would indicate a service date from a vacuum shop. I believe it uses a specific belt, but not sure. I have four different models from this series and they are wonderful vacuums. They take the C type convertible bag, which started with the 63 I believe. I'm taking this info from my mental archives late at night, so it could be sketchy! If you're brush strips are worn, that's the tricky part. You'd have to find an old vac shop that may have some in stock. There are other members here far more knowledgeable than myself, so maybe they'll chime in on the above and other useful info. Enjoy, they are such a smooth running machine and very effective cleaners.