HRS S1308-CM 50 8 pin Hirose connector there maybe variations of this

there maybe variations of this board  so have included the full serial Number with suffix which shows the revision number

these are really nice well made Japanese meters similar to Sifam types

They have 56 positions but one is filled (or in the plug cut) so you cannot reverse them

Or perhaps you would like to build a little mixer then this  would be an ideal set up if you dont need anything fancy after it at the front end

HRS S1308-CM 50 8 pin Hirose connector there maybe variations of thisThese are used on the big Tascam machine they are as rare as hens teeth new and simply none about anywhere Thse were used on ATR machines