This is a vintage pencil case or box. It is made of metal, most likely tin. It measures approximately 7" long x 2" wide x 5/8" deep. It is painted grey or silver, and the top has wording in green and red as shown in the picture. One side is marked "CASTELL 9000 HB."
There are some scuff marks on the paint. The bottom part is slightly indented from use. It opens & closes nicely.