In a type 110 camera of the pocket type from a major german brand, but made in Japan, I found a battery I never came across in my many cameras:
4.5V type K
I even do not remember to have come across this battery, in a shop back then. The seller was a major post-order company, so obtaining a spare battery via mail should not have been irritant to the buyer.
Bu still, why got a general consumer camera such a battery?
I don't doubt that (my battery sample is from Ucar), but why selling a camera in a region where that battery is rare item? (At least to my memory; I shall look into accessories/wholesaler catalogs of that time.)