Nice! That's a great way to come in possession of some good old used tools. They have some personal heritage. If you want 80 teeth you'll have to spring for a new one, the guts don't fit the old ratchets, they're totally different inside. You should be able to bump those to 30 teeth though. The pt# is on the handle. I have one dual 80 but I still use the old ratchets a lot. Fine tooth is only an advantage in close quarters.