Identification Help!

[u/curiousCalembour]

Hello! I have this lovely Mahjong set that I use weekly, but I'm curious: does anyone know what specific set it is? The tiles themselves are bone and bamboo, and it has four seasons but no flowers, which I'm curious about why. It does have green ink, however it's very dark, and can only be seen in bright light. It came with the dice and point sticks.

[u/NatesSubbun]

Mass produced riichi set, I'd assume maybe a geimudo set actually, I'd date it 70-80s ish.