My newest Scripto pencil is the oldest one in the picture. Here we have four Scripto K780s and a Scripto K760 on the left in blue. The oldest one is the green one on the bottom. I would think the 50s. Next the 60s followed by the 70s and 80s and the top one in blue is the Scripto K780 from the 90s the Classic K780 Mexico. Of real interest here is the new old one on the bottom. These pencils are still available on EBay and other places. As long as the lead moves freely in and out the pencil should still be good. Next I remove the top of the pencil that holds the eraser like I did with the pencil on the left. I do this because many of these older pencils are showing signs of rust. I like to use the older pencils but I also want them to look good. I know that some collectors leave the pencil as is and that is fine. Of the five pencils in the picture I have replaced the eraser part on the three oldest ones. As is the case with all Scripto pencils I do not ever use the erasers. Most are hard as a rock and there are to many good erases out there. These pencils look better with a un-used eraser. Add them all to your collection.