About 20 Worthington guitars were made 1979-80 by Ed Seelig, Silver Strings Music in St Louis USA. About 10 made in to market. They have a W on the headstock.

They were owned by Joe Walsh and Heart.

Source and image below: Doug and Pat Show Youtube [see 36 minute mark]

Worthington guitar - Ed Seelig

Thanks to Ed Van Dyk for spotting this.