It doesn't get much better than this: Photos from a visit to the Sekine Factory in February, 1978. Until now, I'd only seen a few shots of the factory, most often in blurry black and white. Gold like these photos keeps me searching for more.
View the Full Album here.
Thanks to BrownGW and his sales/ distributor friend (source) and Bike Fanatic (scanning) for these slides. Here's the Bike Forums Thread where this started. If anyone else has old Sekine factory photos, I'd love to see them.