HQRP 6V Battery Compatible with Mamiya 645 Pro TL / RZ67 PRO II, Pentax 67, Canon A-1, AE-1, AE-1 Program, AV-1, at-1 Film Camera + HQRP Coaster : Amazon.ca: Electronics
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Pentax Remote Battery Cord for Pentax 67 37990 B&H Photo Video