Pretty sure Alpinestars (as mentioned above) did a cromo frame with this plated finish in the early nineties - that would be my guess.
Columbus did METAX tubing which was stainless - it was a bit lardy for it's price and notoriously difficult to weld and get fittings for.
Columbus did METAX tubing which was stainless - it was a bit lardy for it's price and notoriously difficult to weld and get fittings for.