I checked the tone and volume pots and neither lock in the middle position, so I guess its settled, a GM-4T. After reading your response as to modifications and the fact it would lowerthe value, I've decided to keep this in it original state.
I was thinking about those pickups, dont get me wrong, they sound awesome and so clean. I just hate dealing with the battery and thought about the possibility of an upgrade there. Or downgrade depending onhowyou look at it. But nonetheless, I will keep it as is.
How did you determine the date of manufacturing? I'm asking because there is a guy on youtube withmy exact model and he is saying his is a 1980-88?