Here is another set of the Cinelli Bivalent hubs, you can read more about the concept behind them in the blog here and here.
This particular set was recently sold with this description:
Rare! Vintage and collectible
Special Regina freewheel body with splines in rear - uses common Regina cogs from 1960s-70s
Includes all accessories and fittings - see photos
From the mid-1960s
In storage for over 50 years!
NOS - New Old Stock - Excellent condition!
See the copies of the original paperwork - you will receive copies with hubs
Get a little of your own Italian 'passione'!
Reminder: I invite you to contribute by sending in
photographs of your Cinelli bike, illustrations, personal stories, and
articles about Cinelli bikes and components. I can be contacted at