What kind of film am I scanning?

[tom19]

I've been using my Epson V600 to scan some negatives of family photos between 45 and 55 years old. Most have been MF 6x9, but I just came across a batch of slightly larger ones. They are 2.75" x 4.5" (about 7cm x 11cm) and while they are slightly larger than a perfect fit, they do still fit in the holder, although I'm losing a little of the frame. I looked a bit online and didn't find anything. Any ideas?

 

[compur]

See table here:
https://en.wikipedia.org/wiki/Film_format

 

[tom19]

Thank you, that was the first place I had gone. It seems my error was measuring the actual negative and not the image size which indicates it's 616.