Vintage purple art pottery Vase w red clay JAPAN ?

Vintage purple art pottery Vase w red clay JAPAN ? Approx 5" high with 3" D opening. No wear or damage. There's an oval paper mark on the bottom which could have been a made in Japan tag from the '60s or seventies but it's hard to say where this was made I don't know of any art pottery like this from Japan and especially out of red clay and it looks like an older piece I thought maybe frankoma but it seems a little bit too hard on the bottom for that but they also did some purplish pieces. It's a mystery but it's very beautiful it may appear a little bit more purple in the photos than it really is but not much. So this is an unknown piece and I'm not sure the age but I doubt it's a newer product? Super safe shipper with 28 years experience.