Need a part number from the 90's for Snap on tester

I've had this circuit tester since the late 80's early 90's.
It was in it's box for ever,then I lent it out and it came back with out the box.At the time it was no big deal,now that it has passed away Snap on has no idea what it is and want a part number so they can replace it.
This is the first time that they have balked at a warranty tool from me.So as an act of desperation here I am looking for some help.
It's 3-24 volt cordless circuit tester...tester.png