Good Luck. There are examples that will appeal to social history enthusiasts.
Dartmoor Princetown Prison Postcard Devon Real Aerial Photo franked 1935
Dartmoor Princetown Prison Postcard Devon Real Aerial Photo by Aerofilms Hendon
Dartmoor Princetown Prison Postcard Devon Real Photo Kingsway Franked 1921
Dartmoor Princetown Convict Prison Postcard Devon Real Aerial Photo 1950s
