To Bozeman: I too have an early DR-11 in great shape. Mine has the SIGMA with Greek M name on the head as opposed to EST 1970 . The Sigma name is in mother of pearl (I know of only two that have the Sigma name in MOP).
Your guitar was made 1980 or later as that was the year they changed the headstock wording from SIGMA Greek M to the EST 1970, even though they did start making them in 1970. The DR-11 was top of the line when it was made. Almost all of the DR-11 were made in Japan and all of the ones that have the SIGMA with the Greek M on the headstock were made in Japan. The consensus is that the Japanese were better made. I also a pristine D-10 Anniversary model. With good light strings it does stomp Martin D-18 Butt.