Ahhh this is the guitar M and M had for sale. You may of recieved Dry-Z's but they are mismatched as one is dated in April and the other in Dec. Make sure that the top is solid and this could easily be passed on as an EGF-850 or EGF-1000. Do you see flame running down the top into the cavity?
I sold a couple of 1979 LS-100 in Red Wine a couple of months ago.
I have a black 1979 LS-100 but not for sale
https://www.flickr.com/photos/cliffsguitarworld/albums/72157696096644995
I do have 1981 LS-110
https://www.flickr.com/photos/cliffsguitarworld/albums/72157710811696776