SR44 to PX27 Battery Converter in Black Matte Colour - Etsy
Golden Power Stack Golden Power Px27 Alkaline Photo, 6v, Alkaline, 20,5mm X 12,7mm, Original. New - Battery Accessories & Charger Accessories - AliExpress
Rollei-35 Battery - PX-27- SOLD
Amazon.com : Golden Power PX27 6 Volt Alkaline Battery for Minox and Rollei Compact Film Camera : Electronics