Yes Bultaco in 1960 the most advanced digital was 3.1mp by Kodak... their expensive!! DC-4800. They were selling like Sweeney Tod's meat pies.
Can the old images from 1960s be saved by modern software? I think yes. Below is a side by side of the SOOC image and the same image cleaned and sharpened by Topaz deNoise AI and Sharpen AI.
Crop to face SOOC, 0.283 Mb vs Clean & Sharpened by AI, 2.1 Mb. Gigapixel gave 5.3 Mb
Have you tried topaz's latest software, PhotoAI? It has become my go to for first try!