Unique Key Cylinder and Housing for sliding patio door 

Keyway: Schlage 5 pin, SC1

Markings: Sticker on door track CWM-1 SERIES 3100

Special Note: 

Key lock does not appear to be rekeyable. Has a pin driven through the cylinder cap and has been ground over.

Getting the pin out would be possible, getting it back in would be the problem.