Indeed, I had looked at the table hoping to find an easy answer. The two larger negative sizes I have aren't an exact match for anything. #2 seems likely to be form of quarter-plate, but the size is sill off a bit, so I am looking for suggestions.

The first negative type is clearly a half frame 35mm, maybe from a Kochmann Korelle which would fit the time, or a _____? The mounting into the cardboard holder is interesting and I don't know whether that has any significance other than it was a convenient storage/projection mechanism, given that there were 1/2 frame neg holders for the enlarger, I would imagine that they were not used in the darkroom like that.

Cheers, -Fields