Permit for Blackstone's Advertising Pony
- Name of Subject: Harry Blackstone
- Publisher/Printer: Spokane (WA): Department of Public Safety
- Date: 1939
- Size: 7.5 x 5.5
- Condition: good
Permit issued by the Spokane Department of Public Safety allowing the Blackstone show to advertise "by means of pony or horse." Some creasing, light smudging. Good condition.