One of the first pencils from the 70s that I collected were the Pentel PD345s. Solid colors came first then the clear ones. I was in Germany in the mid 70s and I would go down town to the local stationary stores looking for pens and pencils. On the left is a solid orange PD 345, then a clear blue PD345. The third one is a clear PD 345 with a green clicker from Mexico. Then we have a green and white PD 335. My PD 505 all metal sideclicker is next and is one of my best pencils. Thanks Germ. Last is my newest one. A retired gray PD 515 Popnpop. Never seen one before. This PD 515 has a metal tip that houses the point while all the others have plastic ones. The PD 515 is a great addition to my collection. Add all these great pencils to your collection.