Not sure how "How Much do you Type" is off-topic, but if so then this is even more so - though it comes up often with old typewriter ribbons: What the heck is "New Old Stock", and how does it differ from "Old Stock"?
It doesn't differ at all except for the extra hoorah word and the resulting oxymoronic redundancy! Old stock is not new, obviously, so what is really meant by "new" here is unused. But Old Stock already connotes unused! If it had been used then it would not be "stock" at all - it would be "used". The extra word is oxymoronic and redundant simultaneously - quite a linguistic accomplishment I think you will agree. It is also a monument to word padding - something the presence of a few actual WRITERS on this group has made me conscious of in my own feeble term paper equivalent efforts, and which I strive to eradicate. Just can't stand cant.