Lot of 12 HARDY BOYS MYSTERY STORIES - vintage in Regina, British Columbia

Buyers please note: two of the blue-spine books shown in the photos have been sold - What Happened at Midnight and The Crisscross Shadow. The following 12 books are what's left:

7 Titles w/ blue spines & backs: House on the Cliff / Sinister Sign Post / Twisted Claw / Sign of the Crooked Arrow / Hooded Hawk Mystery / Mystery at Devil's Paw / Mystery of the Aztec Warrior.
5 titles w/ brown cloth covers: Secret of the Caves / What Happened at Midnight / Footprints Under the Window / Melted Coins / Sign of the Crooked Arrow

This is my childhood collection of 12 Hardy Boys books from the 1960s. Some of them I acquired later in life, but are older, as I bought them used. Five of the books have brown cloth covers (one of these has a partial dust jacket) and the other nine have the newer material w/blue spines and back covers. There are two #28s (The Sign of the Crooked Arrow). I also have a fifteenth book (Secret of Skull Mountain) which does not appear in the photos. This one has no cover and I will simply include for no extra charge if you buy all twelve others.
Price shown is for the lot of twelve books and one freebie. I will also sell these books individually; prices tbd.

Pick up in Wascana View, Regina, SK.