Is anyone familiar with this Riichi set?

I've been playing Riichi Mahjong a lot digitally in the last few months so as a birthday present to myself I decided to purchase a tile set off eBay. It's really old and a little worse for wear but it's complete and at the very least good for a beginner set. I was just wondering if anyone knows what company produced it, etc.? Included are photos from both the seller and myself.

The numbers on the bottom left of the scoring sheet on the inside of the case seem to be a patent number but I couldn't find any other identifying information. The seller only listed it as being from the Showa era.

I'm just curious so no worries if nobody can find anything, but any information would be appreciated.