In the fourth quarter of 1964, PUMA implemented a new control system. This control system helped establish quality control measures in production activities. The code itself is a 5 digit number. Using the following chart, one can determine when his / her knife was made. The Control number, also known as the Production Code or the Date Code is located on different location, depending on the model. In most cases, you can find the code on the finger guard near the blade. In some cases, the code was stamped into the handle of the knife on wood handled models. On folding knives with blade locks, the Control Number was stamped on the Spring where you depress to close the blade. The smaller folder without locks, the number was stamped on the inside of the brass liner. On the Waidmesser knife you can find it stamped on the brass where the corkscrew is.
Not all knives have Control Numbers. The Scout Models is an example of no Control Number.
You can also use this link to determine the age of your knife.
For PUMA Knives in Germany, use this link: http://www.pumaknives.de/faq_122.php?PHPSESSID=ncmn8hc4nv17f501rcrehehcu3
Here are the code charts. Click on the image to make it bigger.