Zapp Zapp branded guitars and amps are around on google. These photos from a Zapp Les Paul copy were found on reverb.com.

Accoring to Yahoo answers the Zapp brand is assciated a Musical wholesale business founded in 1973 by Austin Lempit as a company that specialised in marketing budget musical instruments and was based in Mamaroneck, in New York, USA. In 1978 Mr. Lempit lost control of the business in a messy divorce battle with his wife and with the new owners came a brand change, retaining the Alton brand but dropping the Studio One label and started using the Zapp brand.