Antique SWC. CO Swiss 15 Jewels Movement Gold Filled pocket watch on chain

Antique SWC. CO Swiss 15 Jewels Movement Gold Filled pocket watch on chain I am unable to make out the movement maker. Case shows very well with light wear. The back is engraved. Watch winds and runs well. Face shows well. Watch is gold in color. The watch is on a gold color chain that is also not marked. Watch is smaller in size as seen with quarter in photos.