fg-75 serial#

This is the 4th Nippon Gakki Red label guitar I've seen like this with 2 sets of numbers.  I assume they did this at the transition from the neck block serial number brace serial number.  I assume it only spans about a week, based on the lower serial numbers only spanning 9,000.

Could you post pictures of the numbers??

Very important, could you post a picture of the internal date code??  I don't have a date code for the other 3 to prove exactly when they were made.

Thanks!!  It's very rare for a FG-75 to have an internal date code.

By the upper serial number, it was made 6/7/1971.