Help identifying camera...

While "organizing" the chaos known as my photographs, I came across some peculiar negatives from the mid 1960s. The film itself is 120 or 620, but the frame size is 4.25 x 4.5 cm. I've searched extensively and the only camera from that era that I can find that took 4x4 was the Agfa Isoly, and I'm certain we did not have such a camera. To deepen the mystery, I was the person who took the photos, but none of the cameras that I had at my disposal could have taken these pictures. I'm all but certain that the only camera I was using at the time was a Yashica TLR, probably a Yashica-A. I know that Yashica made a 4x4 TLR but that was clearly not the camera that I had, as attested to by the numerous 120 6x6 negatives that I have from that time.

Any ideas?

IIRC, there was a Hasselblad back that gave you 4x4 frames on 120 - most likely for those who wished to create super slides.

The original Diana camera produced approximately 4x4 (or a little larger) images on 120 film.

The Yashica 4x4 cameras didn't use 120 film - they used 127.

If I remember correctly 4x4 slides were called super slides which could be shown in 35mm slide machines.