Single ring or double ring?

Need a little help identifying this Gillette. I really don't know the difference between a single ring and a double ring.

 

Single ring.

 

Yep, got one just like it. The double ring has two "rings" at the top of the handle just below the bevel where it screws into the head. This single ring has only one.

 

Thanks, I read what the difference was but without pictures I wasn't sure. I am a visual learner.

 

The funny thing is I purchased it on the Bay and the person said it was a 1904 model not the single ring. When I started looking at pictures of so called single rings they looked just like this one. That is where my confusion really came in.

 

I'm a slow learner.

 

Check Mr-razor.com and look at the old types for pics.

 

I believe the patent is 1904, so the seller just didn't understand.

 

Here's some pics:

 

Got the single, want the double.
BTW

 

I actually went back and started looking at the Razor Compendium and was able to see the difference there. I forgot that I had downloaded it.

 

Now that I have the single I want the double too. Stupid RAD!

 

Where can you get the compendium?

 

Google Books

 

I think razor emporium sells it too.