Good Luck. There are examples that will appeal to social history enthusiasts.
Dartmoor Princetown Prison Postcard Devon franked 1906 Peacock Autochrome
Dartmoor Princetown Prison Postcard Devon franked Torpoint 1903 pubd WE Tooker
Dartmoor Princetown Prison Postcard Devon Valentines Franked Tavistock 1904
Dartmoor Princetown Prison Postcard Devon Real Aerial Photo franked 1935
Dartmoor Princetown Prison Postcard Devon Real Photo Kingsway Franked 1921
