Originally Posted by
Catnap
Here's a 3Rensho Cyclone-era road bike for sale on Yahoo Japan:
https://buyee.jp/item/jdirectitems/auction/e1227564039
The photos are a bit low-res but they show a matching fork. The seat cluster is a version of the Cinelli fastback, which is common for that era. Unfortunately the photos don't give a close enough view of the lugs.
I looked at that bike and a few others. So many good bikes and frames come up for sale in Japan, I wish I had room for more. I found an old catalog page from 3 Rensho. The bike I have is identical to the second bike on the page, it has the same lugs, fork, and seat stays, without logos. The only notable difference is the internal cable routing. The bike you found matches the one on the top of the page.
