FG-75 need help with serial number

No problem!  The only person that has this data is me.  Everyone else would guess 1/8/1972, but they would be wrong because of the lower serial number, and that label wasn't used that early.

The FG-75 is a low end model and very common, although this label is fairly rare.  The value depends on the condition and playability.  It is very common for 50 year old guitars to have high action, from 50 years of string tension pulling the neck up.  The correct fix (neck reset) costs far more than the guitar is worth.  Hopefully you can make it playable.