1800's Antique Vintage German Böntgen & Sabin's Balisong Butterfly Knife.
Bontgen & Sabins (Bonsa-Werk) from Solingen, Germany had many trademarks, they were active from 1867-1983.
The Böntgen & Sabin AG Stahlwarenfabrik was originally founded by August Böntgen and Louis Sabin around 1870 (registered in 1876). The company made many different products; pocket knives, spring knives, camping knives, straight razors, scissors, as well as bayonets during WWI and SA daggers during 1934-35. After 1922 the company only used three trademarks; Bonsa, the leg and football, and B&S. The company stock and the Bonsa brandname was bought by Robert Klaas in 1983.