The Watson Model 100 is an American-made bulk film loader for 35mm film. It accepts up to 100' reels. This is the version with the larger center knob (this bulk loader was in production for many years and we're not certain of the dating). It is in very good condition except for a small chip one of its feet (purely cosmetic, it doesn't affect the light-tightness or usability in any way).
We highly recommend bulk loading your own film if you're interested in home processing black and white 35mm film. If you shoot a lot, rolling your own film cassettes can be a big money saver.