Where to buy 610 film?

I found an old photo camera recently, unfortunately I don't know which one it is, no markings. I date it to somewhere between 1920 and 1950. The viewfinder isn't a lens but merely a mall square window to be unfolded on top of the camera. if you open it, it unfolds a hose kind of thing, so I gather it's a "view camera". I have no experience with those, the only thing I did find was a writing "610 film" on the inside. anyone venture a guess where I can get films/develop them, and maybe a list of these types of camera produced in the first half of the last century?