Nintendo Playing Card Co., Mahjong Set

Does anyone know what this set is. There trays are marked as Nintendo Playing Card Co., Ltd. But I have been told the set may not be Nintendo. Can anyone tell me what I've got here?

 

https://en.wikipedia.org/wiki/Nintendo
"1969–1972: Classic and electronic toys
Yamauchi increased Nintendo's investment in a research and development department in 1969, directed by Hiroshi Imanishi, a long-time employee of the company. Yokoi was moved to the newly created department and was responsible for coordinating various projects. Yokoi's experience in manufacturing electronic devices led Yamauchi to put him in charge of the company's games department, and his products would be mass-produced. During that period, Nintendo built a new production plant in Uji, just outside of Kyoto, and distributed classic tabletop games like chess, shogi, go, and mahjong, and other foreign games under the Nippon Game brand. The company's restructuring preserved a couple of areas dedicated to playing card manufacturing."

The bamboo + urea tiles and that type of case are typical for that era.

Right, @Shangas?

 

https://www.ebay.com/itm/318205460454