In a perfect FPJ "collector" world, there should be only 68 people able to apply for V1, but we are living in a real-world, and many of those pieces has be sold off. Technically there can be up to 136 people (68 V2, 68 V3) who can apply for these 68 pieces, assuming all the pieces had been changing hands before. But I think the number will be much lower than 136.
It will be very interesting to see when 2 owners (with the same serial number), one holding V2, the other holding V3, both apply for that V1. Who will get it? haha.