The always helpful
Matt Denton says it is the same as 120. Load that puppy up and have some retro fun. I had a lot of fun using my 80 year old Kodak box brownie last week. And
the photos actually all came out pretty good. I used Velvia 100. You have to judge whether to shoot or not by the amount of light, since exposure controls are non-existant and slide film isn't nearly so tolerant as negative film. Just be sure to read Denton's notes on the camera, taking especial notice of the quirks of the shutter lever. Otherwise you'll have lots of double exposures on your hands. And develop the old "CSA" (Cock, Shoot, Advance) habit as well in order to prevent double exposures. Unless you have a firm routine it is the easiest thing in the world for we of the modern era to completely forget about advancing the film. Today when I went to shoot my dancing girls I swapped back and forth between the K100D and the old SV. It was sort of funny when I found my thumb reaching for the film advance lever while shooting the K100D.
By the way, I decided to examine other auctions by the person I mentioned earlier. I found one he was passing off as a camera from 1910, saying it was a half-frame camera that takes 72 shots per roll. I researched the thing and found it was from 1935 or later and used a proprietary film size that disappeared when the camera company went bust in the 1950s. And even when it was available it only took 6 pictures per roll. I left him a nastygram.