The late 60's wrap is usually more blue than the earlier 60's were. Or really, it may just be that they held the color a little better without fading as much. At any rate, those are pretty vivid and look correct to me. The wrap is usually not tucked into the shells on the 68 and up clear maple interior shells. They started putting entire wrap on top of the shell during this period. If you have some that are indeed tucked into the scarf joints, might have just been some slightly earlier wrapped shells. Hard to say.

Mike