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Author Message   M_currie Tinkerer Username: M_currie Post Number: 293 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Monday, December 10, 2012 - 09:30 pm:    The easiest thing might be to measure what size spools would fit into it. It would have been much easier if you had the take-up spool. If you do find film and try to use it, you'll have to get another spool. http://en.wikipedia.org/wiki/Film_format The above page gives some ideas on film sizes. If you go down to the Cross Reference section, it will tell you the size of the spools. Actually the measurement between the two flanges, so the spool will be wider by a tiny bit, but it should get you a pretty good idea. Is the focal length of the lens legible? The normal length for square format 127 was 60 mm. The rectangular-image Foth Derby used a 50. I would expect something pretty close to that. The bigger the film, the longer the focal length. A 120 or 620 normal length would be around 100.