I have come into a collection of old family B&W negatives from around 1925 to probably 1945 and I am trying to ID the likely film/camera formats or any other info. 35/120 is about where my format for film neg knowledge ends at the moment. Any thoughts would be welcome.

1 - neg mounted in a cardboard slide mount "Eastmount, Craftsman Guild, Hollywood, CA". The neg looks like 1/2 frame 35mm w. teeth on. No info on the film from samples.

2 - neg 8.2 x 11 cm (3 3/16 x 4 3/8 in) outside, image appx. 7.6 x 10 cm (3 x 3 15/16). Almost all have a thin, 1-2mm) strip along one of the short sides that appears to be largely undeveloped and some look like there may have been some type of adhesive there, which makes me think they were single sheets. A small percentage of these negs have numbers and a smaller percentage have "kodak safety" or "kodak safety film"--so some are nitrate free. The vast majority have no physical markings, but some have a small hole or nip taken out of one of the short edges, and a clip mark from drying is often visible. The images are not always centered or square, which also makes me think they were single sheets--to what?.
I have others of a similar size that were clearly hand cut to size

3 - a small number of 6.9 x 12 cm (2 11/16 x 4 11/16) w/ the images largely 6.2 x 10.6 cm (2 7/16 x 4 3/16). No markings of any find.

Cheers, -Fields