Type: 1953-55 Artvue
Notes: Despite Mack's longevity and reputation as a willing signer, it appears that very few plaque postcards ever crossed his desk. This is one of just four autographed examples sold at auction in the past 20 years—and it previously sold in 2007 for over $9,000. Mack died in 1956. This item has a reserve (estimated value $5,000-$10,000).