When a customer sent me pictures of his featherbed Inter to put up on my webpage to sell a decade ago I nearly fell off my chair since the bike looked 100% original in all parts. The bike was painted black and many components that shouldn't were chromed (hence I called it "Zebra") but it was all there, waiting to be put back to the metallic grey. Though I did not plan to buy an Inter I decided I wanted it there and then and, without a quibble, paid the fair price the customer wanted for it.
Looking it up in the production records yielded a pleasant surprise: This was the first featherbed Inter ever produced, earmarked for the Earls Court Show, then sold to Norton's Swiss importer.
With the bike I received a file from its first owner for many years, showing parts and component purchases from many sources since it wasn't easy later in the bike's life to get hold of the relevant Norton parts.