Hi fotofundi,
I used Google. I did a similar search to yours and looked at words that were used to describe the film rolled from 70mm from a couple of UK dealers. "Hand rolled" showed up on a couple of web sites, so added it to the search terms. Then, since you mentioned the beach pictures, thought what the heck and did the image search, which found the pictures you described. I learned the hard way in school when research material was first put into computer searchable databases. A couple of degrees and periodic college classes over the past thirty years, one learns all sorts of ways to tickle data from online searches.
Glad to help, I had some time to kill before going to dinner with friends, saved me from online shopping or something more expensive, though it made me think about 70mm backs for my RB67, hmmmm........
Linn