Royal Ceramics Vintage Teapot

I think this is a typical Japanese Zen or minimalist patterned teapot, everything is simple and clean. This is from Royal Ceramics and I see many sellers online are calling it Noritake RC and the RC there stands for Royal Crockery. So I am wondering if I am mistaken or if they are trying to pass it off as Noritake? Anyway I am calling it Royal Ceramics and I like the clean design, it is a rather large teapot and will probably serve 5-6 cups of tea.