I'm new to this forum so you will have to excuse me if this is not the right place for my question. I'm trying to find out the history of my stratocaster and I am hitting dead ends everywhere I try to find answers. On the plate behind the base of the neck it has the serial number L13178. I believe this references to an American made 1963. I had the neck taken off recently and their was no date but it had the marking '9=3' and a small blue pen marking in the corner '24'. I have absolutely no idea what these marks mean. I have also taken off the scratch plate and under the pickup it has the label '9=3 YSOY'. If anyone could give me some guidance it would be greatly appreciated. I am thinking it's a japanese copy but I'm not sure. I'll attach a few photos .