on the inside the the wheel it is very dirty and looks that the previous owner painted them with spray paint. I believe the original color is silver.
I believe what is stamped on the inside is Koywa wheels and 680KR...... maybe 690?
Regardless cant find the info on them anywhere. some more info would be great.
PS there is also a "n.o.102" on one of the legs I have found. not sure if that or the 680 part is the part #