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That is a split buss main panel. The top 4 double breakers are the equivilent of the main breaker on more modern panels. The main breaker on that panel just doesn't cut off the other three double breakers on the top. By adding up the top 4 breakers, it looks like you have a 200 amp service.
I don't think split buss panels are legal on new installations any more.
Ron
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