How can you tell the difference of a Maine coon and ragamuffin?

Some people think that Maine Coons can be identified by the "M" on their foreheads. Actually, the "M" is present in almost every cat with tabby markings and many Maine Coons are tabbies. Solid color, bi-color and tortoiseshell Maine Coons without tabby markings will not have the "M". So this is not a good answer as to how distinguish between a Maine Coon and a Ragamuffin.