The Smith collection started when Mr. Ziegler, a 60-year-old retired Air Force master sergeant, read about a collector of thousands of business cards.

WSJ: Smitten by Smiths: Bob Ziegler

Neve was himself a major collector, and owned 160 Old Master paintings, including many by Murillo.

WSJ: Review: Angels With Dirty Feet | "Murillo & Justino de Neve: The Art of Friendship" at London's Dulwich Picture Gallery