Brand: Tombow Pencil Co.
Made in: Japan
Appears to be some in consistent use of the 30 and 50 marks. Sometimes the box is marked and sometimes the pencils are marked as such. Another special color edition of the otherwise black Tombow Mono.
This Japanese company was founded in 1913 and is still manufacturing fine writing instruments nearly 110 years later.
According to their website, “Tombow (tonbo) means “dragonfly” in Japanese and was often referred to as akizu/akitsu in ancient times. Since Japan was called Akitsu shima (dragonfly island in English) in the past, the name of the company also represents our desire to represent Japan's stationery industry.”