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
Pentax 67 Series Battery For Film SLRs 6x7 etc 6V Alkaline | eBay
Pentax 6x7 aficionados - have you seen this battery compartment before? : r/AnalogCommunity
Pentax 67 II + AE Pentaprism Finder 67 II – Kamerastore
Dry fire of Pentax 6x7 + my astrocamera - Film Astrophotography - Cloudy Nights