Hi folks, I believe my Gibson is a 2003 make. It is a 175. Not sure if it is a 175-D (don't know what the D stands for, I think double hum bucker, but not sure). I bought it new from an authorized dealer around 2006. Can you Gibson experts please help me figure out what year / make / model that I own? I am strongly considering selling it and would also like to figure out what its true value is. Also, what sources are a good place to value a guitar? I have never sold any of my axes before. Any knowledge is much appreciated. Thanks all.