Hi Bianchigirll thanks for the reply. I did check for the spiraling in BB and I felt ridges in all 4x tubes exposed in BB. I took some pictures (after framesaver treatment), but it was hard to get good focus. The top tube only has a small hole visible from ST and HT, so I couldn’t see anything useful on those ends.
I guess there may be chrome on both chain and seatstays, hope its clean and in hibernation in case I ever want to repaint years down the road.
Here are the BB and fork pictures:




Spirals inside fork



Could this be the fork?