It has practical value, and its triangular pen grip is very distinctive.
Collection is more about commemoration. Because the Yongsheng 500 is just an ordinary iridium pen, there are many styles, and now it usually costs about ten yuan on Taobao. The Yongsheng 400, which has the same appearance as the Yongsheng 500, is a gold pen with 14K on the tip, usually more than 100 points.
Keep it, Yongsheng has been out of production since 1999, and it can be considered out of print. Not to mention that it has been collected for decades. No matter how valuable it is, it still has commemorative significance. Of course, it is best not to let your grandfather know. Not a gold pen, otherwise he might be depressed.
Wingsung is the English registered trademark of Yongsheng. You can see the gold content on the tip of the bright tip gold pen (common gold pens are 12k or 14k).