SEGA PART # 171-5703

4 Megabit PCB

None of these are dated.  Games in list; Altered Beast, Castle Of Illusion: Starring Mickey Mouse, ESWAT, & Pat Riley Basketball were some of the earliest launch titles.  Games like Super Monaco GP & Thunder Force 3 came out late 1990.  Titles like Race Drivin' must've fit the space requirements for this PCB and thats what they were given when published later on in the Genesis lifecycle.  Each ROM has 40 PINs.  The serial number can be found in the lower right-hand corner of the PCB.