Anthony -

The Eureka M was one of the most beautiful vacuums I think Eureka ever produced.

Here are the pages of a great pamphlet from approximately 1936, showing the Eureka line-up of the G-2, R, M and the hand portable.

An interesting historical note: the G-2 was "added on to" (though it does not show that change in this pamphlet). Eureka tacked on a headlight to the G-2 to make it more than competitive with other bottom-of-the-line models of the time.

Here's the cover of the pamphlet:

The Eureka G-2:

The "R":

And the fabulous Model M. [I love the mention of the "adjusticator"]

And the back of the pamphlet. The handheld with detachable nozzle. I think it was called the Model J:

Hi Bernie -I think your Eureka is a Model 11, or the model right before it. Circa 1928 or 29....J