Let's see...the 456 is a 12 string grand symphony model. (The 414 is a grand auditorium 6 string model that has been part of Taylor's offerings since the 1990s, I believe.) The 456 was first produced in the mid to late 2000s. Not sure when they stopped making them. I believe that some may have been limited editions, but I'm not sure if yours is one of them. Standard top should be sitka spruce and the standard back/sides should be ovangkol. If you contact Taylor with the serial number they can provide a world of information about that guitar. Hope this helps!