Can anybody tell me how I would know if I had a Maine Coon?

When I look at pictures of them and I look at Bunk, my "domestic long haired cat", he looks very similar.

He has huge paws with lots of fur inbetween the toes, a fluffy neck and tail, hair growing out of his ears, and big green eyes. I know this is just surface stuff, but how would I know?

We got him from the RSPCA and nothing was mentioned on his paperwork about him being a pedigee. Or have I just got a fluffy cross breed?

I'd love him either way