I rescued this rusty wood chisel recently. I could just make out a trademark and the word "Germany" under the dirt and corrosion:
Below, cleaned up. It was made by AST:
I already owned an AST mortising chisel:
The chisels were made by Albert Steup GmbH & Co. of Wuppertal, Germany. There's very little information on this toolmaker. The trademark was registered in 1953, but I suspect that the company's roots go much further back than this.