I have an old Epiphone FT-350 that used to be my mom's when she was a kid. There's no serial number anywhere on the guitar, and from what I understand from research, it was originally on a stick-on label on the back of the headstock (what a stupid idea....). Anyway, the inside has a blue Epiphone label that just says "FT-350", "El Dorado", and "Made in Japan".

I'd like to figure out when this guitar was made. My best guess based on my mom's age and when she started playing puts it in the mid-1970's. Does anyone know when this particular model was in production, or if there's a spotting feature with which to identify a particular year?

Thanks in advance!

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