FG-260 internals

I assume it has a Tan Nippon Gakki label?

The Made in Japan version of the FG-260 (not exported) probably isn't too common and looks like it was made in a narrow range.  I have (8) serial numbers from 30525 to 30906.  They changed to 5 digit from 8 digit serial numbers in late April 1973.  I have more serial numbers from 20927685 to 30420318.

I have a 1973 FG-260 too!  It was given to me.  It had wicked high action.  After doing the neck reset it plays and sounds great!!

You are correct; I mistyped the date code. It is 48.6 followed by either 26 or 28. Were you able to make out the images? I stuck my phone in there to get them, lol.

The action on this one is just a tad high, but I have ungodly small hands so what I think is a high action is a bit different than most. But the tone is SUPERB. I'll lower it when I restring it. I think I'll check intonation at the same time. I've had this guitar since 1987 and have never messed with the action or saddle.

Thank you for this resource, by the way, it is marvelous!