So I’ve got a 1954 Tele with a non-original neck pup. The guitar’s a refin, but the bridge pup is original (rewound). I’ve got a Jimmy Wallace neck pup in there now which sounds great. There is no need to replace it, but if I did come across a pre-CBS neck pup at the right price, I might try it. With that said, how do you tell the difference between say a 1953 and 1963 neck pup on the parts market? Is there anyway to tell with the cover on? If the cover was off, would you see different pole heights in different years, like you see on bridge pups? I’ve tried researching this issue but I’m not finding clues to tell them apart. Please advise if you know the answer.