Rusty:
Not mine I'm afraid, as others have pointed out. I'd have to be in dire straits to part with a gun like that if it were....

I do have a similar specimen though, non-ejector in .470 with Manton's name on the rib. It's made by Wilkes, essentially the same gun. No, its not for sale!

Perhaps others disagree, but the general definition of a 'plain gun' would be border engraving only, and wood with little or no figure. That Wilkes is a long way above that!