Probably 127 film, which was commonly exposed either as 12 4.5cmx4.5cm images or 8 4.5cmx7cm images. There was never a Kodak standard for shooting 16 exp / roll, as there was for the larger 620 and 120 sizes, but there were a very few cameras that did (e.g. Foth Derby). The negs could be 620 or...