Here we have two new old items for the collection. On the left is a hard to fine Sterling Plastic #640 Blackboard eraser that can be used wet or dry. On the right is a wood grain Sterling Plastic #641 T-Square with 12" ruler. Both are from the mid 70s, are about 35 years old and are in great condition. I may open up and use the T-Square. Add them both to your collection.