Thats some really cool info.Very interesting ,Thanks!mos6502 said:http://books.google.com/books?id=pKYyAQAAMAAJ&pg=PA159&lpg=PA159&dq=new+departure+%22model+F%22&source=bl&ots=5NEgjlrzas&sig=2M5bUAdd1Yv44n3wYskStg3-7VU&hl=en&sa=X&ei=6mveT6iuEKrB2QWRw5jhAQ&ved=0CE4Q6AEwAg#v=onepage&q=new%20departure%20%22model%20F%22&f=false
Not sure how rare it is. As it is apparently for motorcycles and tandems though I think it's safe to assume it is less common than the normal New Departure hubs.
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