Sorry Anne, but your vase is neither Maling (too thickly potted) nor early 20th C. I'd date it towards the '50s. The number is not a design registration mark, which is usually shown as 'Rg', 'Rd' or 'Reg', but never, in my experience, 'Rc'. It's more likely to be a mold number. I can't place the maker but the shape and lustre glaze certainly point to the 1950s.