This is a blue potion warrant from COS Computer Systems AG that was issued in 1988. Signed by the company officers. Uncanceled, offered as a collectable. 

COS Computer Systems AG was a Swiss international trading company in the information technology sector.

 Founded in 1973 and headquartered in Baden, Switzerland, the company was listed on the Swiss Stock Exchange (SWX Swiss Exchange). As of 2007, Kurt Früh served as both CEO and Chairman of the Board.

The company distributed computer peripherals, hardware components, and memory, while also offering systems integration services.

By 2010, all operational subsidiaries of COS Computer Systems AG were sold, with some parts acquired by the German company tiscon AG.