I would check with the Moon brothers to be sure. There is a version of the Gieseke Nobler that is classic legal, and it does differ from the Blue Box Kit. The Blue Box kit is for sure N-30 legal, but I would defer to a higher authority for the 1969 classic time period cut off date. Do a search here on the forums for the story George Aldrich told me of how BG came to build the first one. I've typed it out at least three times before I think but too tired tonight! Again, one or both the Moon brothers were pretty close to Bob and helped them develop that UHP component kit that they came ot with a few years ago that is classic legal.
Type at you later,
Dan McEntee