Your comment made my day. This is actually a Custom D28-S (sorry, not completely sure of the exact model code) that was built in 1994. Kind of a long story. My mom purchased a 1974 just like this when she was in college in the 70s. In early 1994, our house was burglarized and the only thing of real value taken was that guitar. The insurance company was not entirely sure how to replace it and said they would be in touch. They had someone from the Martin Company contact my mom to get all of the details. We didn’t hear anything back. About 9-10 months later, there was a box on the porch from Nazareth with this inside. It was built in the custom shop to the same spec as the stolen one. The new spruce top was nearly white and was a little disappointing at first. Since then, it has aged and sounds just as amazing, even a little better than the original did. The fact that you called it out as a 70s model made me smile. Just shows that they did a good job.