Electrical Panel Type
This appears to be a rather strange sort of "meter main" or "all-in-one" type of panel

The general type of panel you see here, with a meter socket, utility termination compartment, and loadcenter integrated into a single cabinet is called by various names: "meter-main", "meter-loadcenter", "all-in-one", or "CSED" (for Combination Service Entrance Device).  However, this appears to be quite an unusual device, even for its general type: most meter-loadcenter combinations have a single loadcenter interior, or a loadcenter interior and secondary main disconnect, not two separate loadcenters with separate (backfed) main breakers.  (This isn't a "split bus"/"rule-of-six" panel, either, as it appears both main breakers are fed separately from the metering compartment.)

As to the maker of this thing, my hunch is that this is a GE unit, based on the appearance of the upper half's main breaker; the general case style of that breaker resembles that of prior photos I have seen of older GE TQD(L) double-frame breakers, with the ridged front and single handle.  The general design of the neutral bars is also similar to those I have seen in pictures of older GE panels, as well.  However, it also seems to have suffered a terrible alien invasion of some sort, as the branch breakers in the upper half appear to be a mixture of Bryant/C-H BRs and Murray MPs.