An ancient coin collection worth $72 million is headed to auction after 100 years of secrecy

• A legendary Danish coin collection will go up for sale later this year after 100 years.
• The auction house handling the sale says the collection is worth $72 million.
• The tycoon who compiled the collection stipulated it could not be sold until 100 years after his death.

One of the most valuable privately-owned coin collections is headed to auction later this year after spending more than a century shrouded in secrecy.