Narumi Teapot Antique

I don't know the details as it's not mine, but it's been in the cupboard for about 30 years. There are tea stains, but I thought it might not be good to scrub them too much, so I'm listing it as is. Please understand.
There are no scratches.
Pot height: 12 cm
Height with lid: 15 cm
Diameter at widest point: 11 cm
Lid diameter: 7.5 cm
Thank you for looking.