Hi Mike and others with an interest in the Comrades,
Yes, a bit like the BL, the association numbers have gone long ago.....
I bought an SWB and a Comrades badge some time back so I'm picking that it is his badge but maybe the seller just put them together. However, you do find stuff that has managed to stay together over the years.
For example an SWB with an assortment of badges, including an RE badge, turned out to be....someone in the RE!
The Comrades had a Certificate of Comradeship and this bears a number down one side that will, I would guess, be the badge number. I have one for Richard Grant but I think I'll give up on the search for him!
I've also posted a photo of a Comrades membership card (about the size of an old driver's licence) and that has name, branch and address but...it didn't come with a badge!