Welcome, Vicky!! If you've visited the site before, you'll know there are all kinds of folks here who are very knowledgeable and have lots of great information to share!
The range is from 1954 - the last part of the model number '2L1' has a date code of 'L' indicating 1954 as the year of production for this range.
Check out the Automatic Ephemera section here on the site - there may already be a manual there and if not, it will show up.
For a yearly kw/h rating, though, I am not sure that GE would have thought about providing that information in those days. But you never know...