I bought this 1978 Sigma Guitar off of Ebay. Got it for about $200 (+ another $200 for shipping from Portland to Chicago!) It had not arrived yet but I would like
Sigma Guitars. EST.1970. by Martin & Co.:: Broschiert (1992) | Antiquariat Ehbrecht - Preis inkl. MwSt.
Sigma Guitars - Wikipedia
SigmaGuitars Est. 1970 By Martin - Sigma DR-41 Custom | eBay