Yamaha Nippon Gakki G-100D [Added: Pictures]

[herculeyes]

Greetings from Waynesville, Ohio! I was recently at a nearby peddler's mall and stumbled upon this classical guitar that despite looking a little aged and blemished (and missing 4 strings) seemed to be playable. While typically a steel string player, for $75 I figured I couldn't beat it to practice on. I took it to a local music shop and the owner restrung it and said it sounded beautiful and that he had once traded a similar model and regretted it. He attempted to look my model up and found little more than my searches had but told me the G series typically sold for $2-300 used. I've found the cheaper G-100A models on ebay listings but besides the info on https://www.yamaha.com/apps/guitarar...itarchive2.asp placing it between 1967-1976 I can't find much else on it. Could anyone shed any light on this? The serial is 1368106 if that can help date it more precisely. Thanks in advance!

Pictures, for those interested:
[IMG] http://imgur.com/a/YrjTG [/IMG]