Mystery cassette, Titanium??

Can anyone shed any light on this cassette? it was taken off a 6401 equipped Pinarello originally bought in Nairobi but once belonged to David Kinja.
It's been kicking around my garage for a bit but just came to clean it up and realised it's definitely not Shimano, it's not very worn and it's very light.
It doesn't have shifting ramps but is for a hypergglide freehub.
Sprockets not magnetic and I know for a fact have done a lot of km so guessing titanium.

https://flickr.com/photos/157053716@N06 ... 1254398757

Any ideas?
 
Re:

A bit of googling on Marchisio, looks like a match. Out of business now but pick and mix titanium sprockets, sold without lock rings, is exactly what I've got.
These things must be super durable as there looks to be very little tooth wear and it's been through a few owners. The last one clocking thousands of km on dusty Nairobi roads.
Just about to see how it makes friends with a new chain on another bike, fingers crossed!

Many thanks!
 
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