Overdog,
Are you sure it is an original Gold Bug? This is often a confusing issue because there was the original Gold Bug (don't know anything about them) and then there was the Gold Bug 2 which is still a very popular and effective detector. Then Fisher came out with a new Gold Bug that they again called 'Gold Bug' instead of 'Gold Bug 3’ which leads to a bit of confusion. This new Gold Bug was at one point sold as the 'Gold Bug Special Edition' or 'Gold Bug SE.’ These units stirred things up a bit because they were quite effective (at least as effective as the Gold Bug 2) but were considerably less expensive. Kellyco had them for a while but I don't think they sell them now. They are still available and are simply called 'Gold Bug' and come with a 5 inch coil. Then Fisher upgraded the software in these units and now sells them as 'Gold Bug Pro' which has a 5 inch coil, and 'Gold Bug DP' which has an 11 inch coil. That is my understanding of the Gold Bug saga anyway.