Here we have two Sterling Plastic architect's Scales model number 682. These rulers are from the 60s, US made and are in great shape. The cards are dated 1965. In the 60s Sterling Plastic only used red and white colors on their packaging. 70s they added blue to the packaging. Sterling Plastic was the leader from the 50s to the 70s in plastic low cost school and office supplies. Add them all to your collection.