funnily enough I did a search for Massi last night and found the original sale for that exact frame. It was sold as a built up bike .
I bought a yello Massi frame last year on ebay. Its poor quality tubing but quite a good paint job. It had been recycled through Brixton Cycles Workers Co-operative which I quite liked the idea of . Its rusting like the Torrey Canyon so its going to need some serious treatment soon or they'll be nothing left.
I use it as my winter hack and it feels very stable at any speed but then steel always does .