That model number is for the whole system. The number I gave is for the amp. It is stamped on your first pic. That is the number you will use to find schematics, etc.. You may be able to use that number to determine if the table is original, but there is far less documentation on that number, if any.
As far as two mono amps go, that is killer, but finding a second matching amp may take some time (or you may fall into one, you never know).