Motorola was very easy to get a custom part number out of, they would happily mark any large lot purchase with a customer supplied part number if asked, it was part of the standard order info if you were buying in bulk. That there are 3 different batch number means this was either a regular IC marked as such, or a custom interconnect mask for some customer who wanted a slight variant on some die they made, and who ordered enough of them.
The usual DMM diode check things will at least get you info as to what are inputs, outputs and power and ground pins, so you can class the IC into an appropriate logic or analogue family and further class it if logic or linear into a rough type category ( if a logic then TTL x input y output and rough pinouts) and from there a breadboard, some resistors and a current limited supply will give a logic map to tell you what it is.