Kalon

I have a Maestro Fuzz-Tone FZ-1B and I am trying to figure out how much it is actually worth. I've been doing research and the prices seem to range from $250-400. Also all the pictures I have seen of it, it says Gibson on the front however mine says C.M.I. When I looked into that it said that C.M.I took control of Gibson from around 1944-1969. Does this make it worth more or less? It works great and it is still in pretty good condition, the paint is scratched up a little bit but it just looks worn. Does anyone have any idea?